Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfb6dee62efa9b8…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4d3b92cb5d7d83e57e751346921a790 SHA-1: 385bbc0f5ba76eac0d3bd242c34df083702a1cb2 SHA-256: 0dfb6dee62efa9b8bad3b2105e4ffaaa4b1415113fb426b8c20c8f3775e218b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests a phishing or malware distribution campaign where the PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd34dd4201---bodevimer.pdf In PDF document text
    • http://caphegiabao.com/upload/fck/file/zolemopobufinodifode.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a106b933---dipumorase.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efcabb369b---14214316963.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/soxazufusaxunizaw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc52f14f6f---diwerufokikediv.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8bm9t0s3m23dc1cheuhi2rd7n8/jinasetiwebes.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/lmr4vrfe006a2dqakpurnqt74f/25973985708.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a4bbf35560142877c72279f17c9e825d/76549590926.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/linelamususavajukonixazo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/61642852137.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/xufiweguwamitamenunapo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff8cc8d36---wuvotakukov.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/kijefafejilabe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/944f122ba7e720f4c91b45f67e87b591/kowugitenilenomipije.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30f01ff722209952f856e548528e7124/80233170406.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/12427059164.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/73a350d4b4c4ef958c59306f06e1b7bd/7459515487.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c26a7d4f---42119609970.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/1583608168.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/768b4db52d3ba24af92a5f5fcd407584/xutalesivupoz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d18222e04d0---tinoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=could+earth+be+hellPDF 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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10252 bytes
SHA-256: ef34457b5c044e847165b2e05646be8db44d4db3c2cd9811e0fbab0f1a2e0320
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 17368 bytes
SHA-256: cad23bbd2762b7f13b6bd66be305c2792e244d46a97174056645d0be82d71b98
font_02_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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