Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e3b4309c8cadbc…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 07:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ae10e20b252918e8be9d38ca43ca269 SHA-1: 1f58264f3d8e6618fc9e385a63072881d89afed7 SHA-256: 66e3b4309c8cadbc9b477bc75e627484c3a7c658119393e4026d3c8591d0d1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=tiny+toons+apk PDF link annotation
    • http://vlajkylevne.cz/UserFiles/File/887742387.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/90732988142.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/92766680496.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/51811355422.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/zowenujasuxevawo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/31606031984.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/1450906663.pdfIn PDF document text
    • http://holzweiss.at/62304843415.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/50525050340.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jekenanoloxiwenogeja.pdfIn PDF document text
    • http://krzeptowski.pl/file/97606737780.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/93246922426.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/zasunomefexew.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f7b1c00bc073d20671fdd3b07538e68a/95199448727.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/wozoxirovoxunup.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902015753993.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/20762975356.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/59657106111.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/nudasumimuxutiziwewexenom.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/dukogamonikotapew.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a916307b4---36039998638.pdfIn PDF document text
    • https://ms02bet.com/contents/files/27942957146.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/121c420ccc07dcfb123b77a2ff11d3e2/35346414234.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/338def291a405878d0ca4a16da8f2635/53130028697.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/repifegivenimu.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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 18724 bytes
SHA-256: 5b34e8426e64343d36b151967342ad1a514c5646fbf37ae8237e76abe3801727
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10136 bytes
SHA-256: 424ebffab5a2bdaef50416a89959cf987f9ae3ace72f9bb9b1d792d0f059281d

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