Malicious PDF — malware analysis report

Static analysis result for SHA-256 b244276867294409…

MALICIOUS

PDF

100.9 KB Created: 2021-09-02 13:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e91c8e55d800e92c1192b3d9e61b71d SHA-1: 9f01deec6003a3155e1696bc5ed9eef2222f85f7 SHA-256: b244276867294409f68126f1e3469d3b950821d46f06fbf54b61e809d6c3d009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to potentially compromised WordPress sites and other domains. The PDF structure suggests it's a link farm designed to redirect users to external content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://archism.ru/uplcv?utm_term=october+2017+sat+qas+pdf PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc70a8b5---tajuvewimab.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/m32k7h4dfouluafeugp429n0j7/kakaxaf.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429013623776464.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/47309993007.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3ef90d9267da8c1a2cf81bb6a75d8e17/solexedogeziputa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/v9p55c9k63k7diq6ql447v4kk7/53770499493.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/72449936685.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cks0jinmjbevr3ghiqkknisle6/92568515053.pdfIn PDF document text
    • https://akvaguru.hu/user/file/57387677602.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/157f9d9b25f9d1b5255698f833722308/32355592896.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/rutakevowuzixopu.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609072a8397f4---89592587007.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/75751555085.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8996da9b9---57014691799.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/92150136927.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/96991389529.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gonibuk.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/59466290692.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/wefokitanunapojovibotuzi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bc750364---gikinanixazigemasesitonen.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a379919f625---13574936010.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/37a52ea44b940f6ace151529eaf8abcf/jafuxi.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/18743881063.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/8737065102.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0ajfr5b96sp23kt3dnvbntm8e0/nenomesolixizalivos.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/17414340489.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_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A17 11024 bytes
SHA-256: 44391d7521bdfca7ac169883d9be5e8846ebfaa8b85fa5a37fdcad03a50b2a23
font_02_sfnt_off00015392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15392 19616 bytes
SHA-256: 04e834eac9964df53169fd78faf93307ac8566638f1a43abfa4a1e6d0274c7aa

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