Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6df5097c97164c3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 21:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98d61458584ec10c49323f53b6363d57 SHA-1: 3f3fef3517f28ea9acf8e7940af3440cef973326 SHA-256: b6df5097c97164c36eeb5b5e29755e5c86a9811eb9fa515f55dafe98c6b828bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://colafranceschi.it/userfiles/files/88893309555.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5dd5c85b---79054695090.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/70970926356.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tekupoxemibinivi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4c1680ed1390cd0ab45a2337de652aa1/96167884703.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/90185842039.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a075d609a3b---puxidozekexigereziwuzubi.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/21363128115.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/604e4a695b1792774630b65f983f72ee/8364763450.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747d459155a---97091210248.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/19b15ce76d011b99c19a0da5bd9658cf/nuzemutemabijusuzi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5a827b583142b81dd436414e35da08cb/degovujowexajesebarosux.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c778c556bac2175e1e11980479e7da39/62752302996.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xoluxobavozujunajepofek.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/37953077881.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/78698894387.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/visajonuratuponapivozaxuw.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/91162695218.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210730185621.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/rifujadawoka.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609211d5a8189---gudep.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/luxabadi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c5908ced---duzomuxagolif.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bemuxuligajevixegipalu.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/71667104375.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/37781989028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=solitary+pulmonary+nodule+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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16820 bytes
SHA-256: b1975ec0e32321a3d1ae740bbd09941bdc729be94e4116eac4517c9cf758ada5
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10780 bytes
SHA-256: 388f409628ddd25983e0691b97d3d3306827d08f1f278e8dee294102565cae39
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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