Malicious PDF — malware analysis report

Static analysis result for SHA-256 a011a2a28d9b4906…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 13:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c7fe513708d52b5fca880ff2b5579ee SHA-1: 2a8391a4d029ed82ca8250e02970bdec958839c3 SHA-256: a011a2a28d9b490644607397b834d0f6d86d85fe707e0ed73e6215a0bc7468ec
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to infer a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tractorpulling-emmeloord.nl/upload/file/pureger.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/70961305680.pdf
    • https://invest.pl/userfiles/file/lefosopakemu.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/jazobiwodotapudikofujoji.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/snfu9ip4it8ub2vcnji5lk2mc9/fogoxulolujedexe.pdf
    • http://german-ex.com/images/blog/file/77375480143.pdf
    • http://theurbanbazzaar.com/userfiles/file/motaxalesagefoganavobuw.pdf
    • https://soechi.net/userfiles/file/19526364777.pdf
    • http://studiodebiaggi.eu/userfiles/files/sikakemevegepegaj.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da843c7c---32014372953.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/rulekaripezokikixajir.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/16236006635.pdf
    • http://yevres.fr/ckfinder/userfiles/files/zevasurijed.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/58660706114.pdf
    • http://wieswioska.pl/userfiles/file/vezur.pdf
    • http://cisseo.net/userfiles/files/pobigobejawiras.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/54036973873.pdf
    • http://www.pes.edu.mn/ckfinder/userfiles/files/84288578142.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d785635c14---zoloro.pdf
    • https://cursosadistanciayonline.com/medios/files/xolijexivu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3191176adfbe4e14214cc34f3f8bfc05/73658545122.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=structure+of+abscisic+acid
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69b.bin
11e1e54dab9d8616e6fe1c6f527a813f126c7b372517516cf5238aaf7a6292a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 10632 bytes
font_01_sfnt_off0000ef14.bin
07129f1b5b6f8849c6854c36d56e312d0c76e6eddab66cd7edecc69fb1b9f69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16688 bytes
font_02_sfnt_off00011a81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16792 bytes

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