Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f76bcbbc6d297e7…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 17:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b8cb5c68efe99e109c334866c22ba64 SHA-1: c2743d8272a7018bc77803f739be5e73ae58ab54 SHA-256: 6f76bcbbc6d297e77856a7da1084eda6f1e36f656115f7f641344433f7b46037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=subset+of+two+sets PDF link annotation
    • http://fbrasil.com/userfiles/file///gekonode.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72209362951.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/kagedifijini.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pusoxilijaxubirasiwis.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/kitabulujaminiv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b54cb5b96---60273607028.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kelimunuwezuwuxaguxeragi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27677621779.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/xevupedagamu.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/xotafamonilome.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/7610151395.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38525695967.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/98722457575.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/28942716236.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/52557888840.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/25864760113.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/likipoparefudigobuwijataw.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/60143951933.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/44658659850.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ec8c29b17---22645824174.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/60248914184.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/32676078588.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/62757574456.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2b7145c70---wefevonibite.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_off0000b3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F0 10104 bytes
SHA-256: 313bb1d8b7536a7ec7ed555acf4d070003d2c6db773c9bce4433f4512a265d2b
font_01_sfnt_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 16560 bytes
SHA-256: 6fb04d3ba4fdb110cd40d0f59102fa85dfdbea74b79dc41eba4f5e07f3452bfa
font_02_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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