Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3ed5129da0e499…

MALICIOUS

PDF

112.4 KB Created: 2021-09-04 11:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90b220e487482eea257ea35774b5392d SHA-1: fafef184925540b6822563b9dc70ed639b1a287b SHA-256: ab3ed5129da0e499945435e312fbaeb14064d844118730e6ffcf1c6b465168e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lensprovn.com/ckfinder/userfiles/files/juwoxinov.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/69336277724.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tawab.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/04afuci5i5b5eqil79avuh5sj0/60654406618.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/wigirakokidezexapojoxawiz.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/sewudefaxam.pdfIn PDF document text
    • https://harom.ro/files/file/33549907833.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/semavogogonufarejodila.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e12d54486---81826342191.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/julujafebuxomazexibanedez.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/8104371736.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/82635699328.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fewasomo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8074cc03d---xibukoxaluluzozofore.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vewiwiselunonekozexu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/wugovelu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7769a7ca8740e449f0e4f5d2693c22a7/80653129267.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2465f3148---jawolize.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zivizivugeredivozaju.pdfIn PDF document text
    • https://digireg.pl/upload/vobagise.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/45913344015.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6ab22d3634c61a74c2a026de06cb5648/vedipemebenojeperulojiwo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/40435260796.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/85201353132.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4fjcbt6ot9jji6m01uqpv3haqg/26142592288.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/nedobom.pdfIn PDF document text
    • http://nineslash.com/user_file/file/sidonevaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=advocacy+role+of+a+nurse+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDF 18292 bytes
SHA-256: e4b4be5b89fe6701f3e6f030db3807f1a43a2031a670ac4f3517e501ddc1a323
font_02_sfnt_off00019afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AFC 10684 bytes
SHA-256: abc34344c2a9d154a814e0ec84188b47141aad6c50fc1e425dadfc0694b59db6

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