Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6994a52a08fe14…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 17:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3f3515894b86e319c69141662d63db78 SHA-1: 00431418a85be6c37b78e5fde18a271b24f3ced3 SHA-256: 9b6994a52a08fe14d0f58321c9707fcabcb6293c354332e050cea9b320d0a953
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to PDF files hosted on compromised WordPress sites. This suggests the document is designed as a link farm to distribute further malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dayton+bench+grinder+2lkr9+manual PDF link annotation
    • http://videofilm-tv.ru/content/File/jevefawasiwitofuwolijegu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/13905793358.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/97787267929.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/32365319535.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/79974432768.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/tasawifapi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pegikirusitozuxuledaw.pdfIn PDF document text
    • https://badrivishal.com/media/vepekorerir.pdfIn PDF document text
    • https://doitoutdoorz.com/file/FBH59eOwrk6rNfMr.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9oqnur70eusfcv3o2v8h8oort6/33921621696.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mewuxejarebatejupuzu.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/lewalagugabeg.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b27ffdc4a820e961cccdfa89a978c140/wodosuwolagadoguzanovelo.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1c8mq28o60ujls4hobt75pjo7j/62733784934.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cb4a569a---30743544023.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f97ba56129a6c4792617a3ca4477438d/wepixidepakikadenajor.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ojf2tmi9jndokrd44hvlbacqdc/21401369.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mqt6hd48vbrh3r7c3falpbmog8/96007042330.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509182103.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosikoledofaniwobeso.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9c8jhnv9dnpdvml91becp411f5/mitafopesibak.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773248e2dd5---tijezeju.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/susafidubo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/51539214360.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/1127224512.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/63449291580.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11384 bytes
SHA-256: ed09857905a31b9375d54a8bf3ec8bdf34885348397b40ed1e725ac2d4b91a80
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 17644 bytes
SHA-256: 45b3e7cc8e4a49aa390a8c789449eb1fe5261288c6392ec827abb6cd2de4fde5

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