Malicious PDF — malware analysis report

Static analysis result for SHA-256 010f8d5d29ad340b…

MALICIOUS

PDF

136.2 KB Created: 2021-06-29 10:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e67c00832de228ea6567919f51e72895 SHA-1: e8f7400781fd4320186a71d11fad39dcff4af6bf SHA-256: 010f8d5d29ad340ba3065a07322d4f6d7728fdec252958497fe7c2775d269f42
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a 'Browser extension / update installation lure' and a 'Visual download / call-to-action button lure', indicating a social engineering attempt to trick the user into installing malicious software. ClamAV detection and ML classification further support its malicious nature. The presence of numerous links to potentially compromised WordPress sites suggests a link farm used for distributing further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8356

Heuristics 8

  • 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.
  • 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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6eac9fec776537fd49a2b41928e514fe/vufapajewebakobubib.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a409326c1d9---kamemaxoxegakub.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b867651b135---84923236179.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/94e40048dafd3fafadaa9cb4f4c5739f/15391025308.pdfIn PDF document text
    • https://tmtteks.com/files/zibelafegenom.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d7a51096a92125a419fa67c52eee2d94/25196564187.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ikdlebiefqsmi6ag1ucn146lbt/20061729040.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i760j5cbm6aqulqu0dqadnabuv/93913491401.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa4ac485d---66227688968.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607231e1da747---61284273942.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3a01fa4c6abc74e57e92fb1a640f72a/wodis.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/mutuvewola.pdfIn PDF document text
    • http://xycrusher.com/d/files/21980172867.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4fdb0ef9---pifarebarusudifefile.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcaaaa5be58f0e92e4209b824ee46ef3/75119679796.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/26851346655.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gemuraposur.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/61372238196.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afceaec7ca---42799578300.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60c87c4d4---gavigunep.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/zawenefajobesasolalu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210524/file/kudusevewibukebat.pdfIn PDF document text
    • http://nkland.org/userfiles/files/27154675243.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8900cb35---131257029.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1554cgh0h3hf8nd0fbgu8qhhl7/zoburexapizibimupepev.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b19da47480c---gedekigakutip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ant+video+downloader+chromePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 66060 bytes
SHA-256: 586112281761bdef954cf048ca9162983c5158b3bc9f2c8c77412c9f0aa8b610
font_02_sfnt_off0001b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9AB 16784 bytes
SHA-256: 57654108aac54283e0cc06675c32cee059c6f84bebade0fc057d7555ff16a196
font_03_sfnt_off0001e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4EF 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_04_sfnt_off0001fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA1F 10600 bytes
SHA-256: c02e575fef16cfe770002fada3d331346331517a0c0edeebda82f5ca1aeecdf6