Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c4f95e711d0cf7…

MALICIOUS

PDF

94.7 KB Created: 2021-07-30 13:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbf9051c293826acbfcba306df403046 SHA-1: 69b6bdfe0e00400335720350d9456fd488c44c65 SHA-256: 61c4f95e711d0cf7c44c2fee45b327f319c08de96da18a5ab584a3502100282c
192 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other domains, likely to download further malicious content. The document body, though obfuscated, combined with heuristics like 'Fake invoice / payment lure' and 'Visual download / call-to-action button lure', suggests a phishing or scam attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=11+standard+admission+form PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/87562010e2ecad3b60a76f2db644c814/64926941435.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/55598541837.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75bad06cce---duwapopabejokipewesup.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/pivotufofilemawob.pdfIn PDF document text
    • https://ms02bet.com/contents//files/laxurizadekididemanijok.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/22147063627.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94b876077---fevijod.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7f57742f---6152956860.pdfIn PDF document text
    • https://makenie.com/upload/files/21771601369.pdfIn PDF document text
    • https://cooperspick.com/files/majeritijenajajorukel.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/jefemelesejijekowom.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cde9c240---rumojulexazibewubusa.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/biwasojizuwomaw.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/86240566928.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jajf617mr7v28dkcpj1oi2flk0/zozamibodijapujekive.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/70262982790.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/vodixonurokikezibu.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wafovipujoperenadal.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7009c06ef2---51703405361.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5amnkd8q330jdniqoilcck42go/fowugirarumejudimubem.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/zofuzusapedopodapivaja.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/dapixiwumifibi.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jidunejode.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d815adda5d---84778323106.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 10292 bytes
SHA-256: d379fb1184f75293bc253c556d2b587566283df0e5308685b76305ee1c18e4f0
font_02_sfnt_off00013d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D95 17696 bytes
SHA-256: 390100fa471debb5c6969c8cf3497e08e2d9f59956dfefa97b4f1cc7ac91bc7d

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