Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a46c69dd00c71…

MALICIOUS

PDF

62.3 KB Created: 2021-08-04 23:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f2dfab441a92f8546695a51ec5b2a3b SHA-1: 4b9e3f3dab7e95beef5833078f26e1a583012628 SHA-256: 472a46c69dd00c71c99cbbaade4910de5e888463db62a96ac26ed2c050b3f938
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=how+to+use+samsung+dishwasher+dw80r2031us', are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9287

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=how+to+use+samsung+dishwasher+dw80r2031us
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd3a7bf8e---89726033764.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fde273fb104ad8dceb1e8a867175a7bd/41060072095.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec76047803---zebuzifagokinikonaf.pdf
    • http://mercuresamuichaweng.com/admin/file/ratirupiva.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/sasoze.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/otcgb4ehv4gs4neavj2rkrg594/9061273732.pdf
    • http://tamker.hu/userfiles/file/37110759881.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96bdd9bfb---39644453387.pdf
    • http://abwninemile.com/uploads/files/68233390485.pdf
    • http://suseefinance.com/userfiles/file/vidovabuwekasogidukavok.pdf
    • http://top1np.com/ckfinder/userfiles/files/5765912778.pdf
    • http://vtaky.sk/media/file/46180269843.pdf
    • http://www.dean-cpa.com/files/adminpic/file/8551009650.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/09f6ecdc5b9bc89eb469640a1a02ff91/nivanojejiz.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3f902j3hc3jp78bimdcukdn045/39379698948.pdf
    • http://macabrey-luthier.fr/data/Files/pewifozizadi.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/wijewakodeveduzogagifusi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/39e4ca611b8cdfaf536b056da818857f/66122746010.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3dbbef29b---wuxodisunebebonabi.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074ced8ccc65---lubulorukebubawosodilet.pdf
    • http://mutitar.com/user_img/files/43005242521.pdf
    • http://bobas24.pl/Upload/file/72839680723.pdf
    • http://ototavandosemesi.com/resimler/file/depokesunomimobofu.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a10cfd81a7fb031a6d51188121a5a7d4/sonovebe.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3eb.bin
d13fbcb6d2a5867c5557aa2975623d8ae1af6c3be33f71659f2aad9bc646cf85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 11500 bytes

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