Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed11e861f2deb73…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 17:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75645dec499f31d56b13cf6c828169c5 SHA-1: 398f6d91c3ffcb3c440dcd13fc6185ff12ac0418 SHA-256: 8ed11e861f2deb73ed9ec0b7522fe8fc1189bc5b7941adf5873a83759be96c63
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown domains, likely to host malicious content. The presence of lures such as a 'Browser extension / update installation lure' and a 'Visual download / call-to-action button lure' strongly suggests a social engineering attack aimed at tricking the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d0c7d7a1f7a8dc957d87300cf5691aad/69303656604.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8d5dc6e8d178c3a263dd8a13a05b3615/wosijemagodadidefaxefojom.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/49285217885.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wolufexegijake.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/50944371148.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/ruburaje.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/degujemeruwasakajani.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607546c6a9d43---78172093638.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052206481573499.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/sipirigomipanutemegasit.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca17fc4562a---42773972373.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fowuteti.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a580d53685---molawagexopojamidofiv.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/87698070577.pdfIn PDF document text
    • http://fullx.net/files/85479101501.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/47715869297.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf2d7515b---16597771724.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/gajideviwugikapukow.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ip72up0dughhi70dghp97afa07/92751217170.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/11622027590.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/21666334306.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/54840640683.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/40959643659.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/kumajen.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xosolinomenuko.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/af3c000bf67d575b0831a79bcf0a907f/gonon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+claim+money+from+western+union+philippinesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 11176 bytes
SHA-256: cf81c2414631ead51d16de177ed2a0e17843c784d966b27904a295a90cfb4b4f
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 17452 bytes
SHA-256: c1998c19777531d23cf8351ff3f6f1b40a3f8f6e48b7f0827bbbfac46b698d91
font_02_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001497b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497B 1980 bytes
SHA-256: 3833bf60b918eac464e070b33aec69acb76d963d3cc7d83e8dabd6269f99795c

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