Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2a70b64b06c9a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 16:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 389085801354eb3e063989e292e43f01 SHA-1: 9dac3319f39f9a1fd0a57073d66c6ee3da593b81 SHA-256: 86d2a70b64b06c9ab7f9af761c5eebb3e85eeb03e2141ab9b22e654ff4be77eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristics and URLs clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://alajwakh.com/uploaded_files/userfiles/files/zitakikivixuzelaramidaz.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/vezafuribu.pdfIn PDF document text
    • http://surausa.com/uploads/files/werenuvewekeduwurixal.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hfgcb5gk5k6ke5hh1nocme12u2/bumovifevevirulula.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816afdb095c---kaxubovidikokeko.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d2bb257b---gubajevu.pdfIn PDF document text
    • http://stl-hk.net/userfiles/96287005582.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/9136163328.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/kodunerixuxumorat.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/fuwiwerube.pdfIn PDF document text
    • https://brakos.it/file/kuwonusekuzijo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3f4qkjc5bqr8rlk8u8vlamd8sp/movibabosibaxad.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/16426318950.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/83321743579.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/96247579315.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/puretagosirevelinuwezajas.pdfIn PDF document text
    • http://nfc.soo.jp/file/63870324521.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/52591272736.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b550877c---zubanibemajulajituw.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/beuju89ekel8d4r8h41m5mn9jo/4396397968.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/41912869673.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/77044386117.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/6456272275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=banana+definition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10232 bytes
SHA-256: 6e9ee1b1a3f8d016d83219773453ce57f136253e58dad7659365f0ec6c701e81
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 18696 bytes
SHA-256: 9a45f31171265705b7d7ad28ae231d444fc4fadb2b5a2650d126d9a8590d26be