Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2db7f7a4afc4d5c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 17:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a463afd6e4803edad53f2bb92d44e289 SHA-1: 3d2068e9b428d9293d0d9222509ea14308668110 SHA-256: b2db7f7a4afc4d5ca97b5115a4e0fe0e35d4c8afc72d6677851cfbda381afde2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=pacte+internationale+relatif+aux+droits+civils+et+politiques+pdf PDF link annotation
    • http://urbancollab.com/userfiles/Proj_Name//files/fixikare.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/95614892756.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/welefifozexudabujatafufa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zobusinuxib.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/peximazatozawinoxekuso.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f01d16088e988ea161cbe242215e0ea0/bapez.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768904754e9---jutalusaxazi.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nomewozoludibusesef.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/53289957939.pdfIn PDF document text
    • http://korytnica.net/data/files/63745220895.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rk3t303md170gtvnallp1msl0k/nojojupijakobiwuj.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/29840283117.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xogagabixerowuwiz.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/vevunafotuzamolavemujawu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608594de77991---rutexeze.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/rezozibuzegiratunele.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/880e894d2aebe0c9fe071d795c1eb976/76084220439.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_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 11028 bytes
SHA-256: f2a2ec9bb284b211fec0120f8994ef7213589fa70cb2c742008a0ee4fe315f6c
font_02_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 18436 bytes
SHA-256: 3b62c09aa13d288dbdecec4d917c1dc2e4617bbd0da07c92e0ec5aa324986bd3

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