Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fcc2976f9df14f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 23:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5af481556c74a777e59445b18fb39202 SHA-1: 2c30e46ec94279f9c5bd0d9a63de5de0e65411d7 SHA-256: a0fcc2976f9df14fa3a1e85730d3755eb9580ac9f892e88925c90e1050e02b77
176 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://moderator.lt/components/com_mijoshop/opencart/image/data/files/xenasej.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa495a196---linokejivasezipigaxogem.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38240072477.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/177b697bceeb1cf02abedb0cb6f31b28/wijeke.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/94813117000.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b339a8415---30053144899.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/raxakib.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/46233552340.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/78694629210.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/atiit4t7n91sgm04fuoovo0s9l/2419019693.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47641d2f0---82003054202.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/vobusizo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/pexiridexeviwumowe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f73869262f600994d854975ad8156c24/bixeposodiwutakujobase.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/natomaxakuj.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/70164696952.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/25047997997.pdfIn PDF document text
    • http://becucci.it/userfiles/files/32122693590.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uj7gqirghu6ers4rdc1de4cnfh/15118739820.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/66779100411.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/17573878514.pdfIn PDF document text
    • http://popmetre.com/news/files/54056963937.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/butazevaxigeboxetadafaxu.pdfIn PDF document text
    • https://photofetimages.com/ragavebutit.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146eaf48da0d---38358344640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+legends+god+mod+apk+2020PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 11004 bytes
SHA-256: 452e3f6333898f7b59cdef650f4205b7da3b02d9962e76450b8916405fbaf77c
font_01_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 17488 bytes
SHA-256: 19f933c7d0f8ed176f6dfc76db950b3cb636f61ff5882b3642cbf471ec1dc138
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1