Malicious PDF — malware analysis report

Static analysis result for SHA-256 da51cac4b695ed2a…

MALICIOUS

PDF

80.9 KB Created: 2021-08-26 19:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57349c82153f334d749efbb637922735 SHA-1: 72e65e4c73092cc2f47526c4d0082ddc1a093265 SHA-256: da51cac4b695ed2a1367e4fe9d0282fe2489fe7d8d48f82cafc43611a2954532
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, increasing the chances of a successful compromise. The document body was unreadable, but the heuristics strongly suggest a malicious intent through the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ff463bfb108d3f7639600f2f109438de/dipisedugokagozimawifa.pdf In PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/ginowukesatezix.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/banigolatujoratabuxap.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83dcd952d---kibopep.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/89339176913.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cb9031294---84326512640.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/55shhq7d1ogb47ml7sgedcb105/45125915664.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/betoretik.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/41403700209.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/30276027341.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4c580f2494bb22290eacc72bd903ce2f/liketavevukalojunuwe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e242d3deb47---12667217922.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a1e8339336ee49c1837885c049df61e9/roromoletivatexivuvasa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc71d2f1ab---rufefamo.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/bumodelafaladubalapigav.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/piviwexob.pdfIn PDF document text
    • https://equinox-e.com/upload/files/sezuniposaguxu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d0d02fdcb2deebf4dc0b045eb644b57e/nugunaponugu.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zobetunepenafo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/39f42c7dc41c17ee82dd6fcf2ba95023/xedomewu.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0aa1f790e81a9a411f4cdac259b1a8aa/siweje.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee55023b83---dulupiwigufevoxumaxi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f31abbd73e83247f13aa598076e6fbb/63603815718.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/26698919534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ultrasonic+testing+question+and+answerPDF 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 10884 bytes
SHA-256: 853c195ded3e9703cd51a558716e434dd7f3412bea8f34167e078193c820996b
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 17424 bytes
SHA-256: 4136d3ab5ca75371ea0a6fd37fe91a8366f1cc3a8c77b2f137e2271bae35511f

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