Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd4e26f12e48921…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 17:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 448b449c9c009ca8bae76d1370a317ad SHA-1: f083d9b86a8975885848bee85410aa03bb91f472 SHA-256: 5cd4e26f12e489211deb57e352bacc699a26b41d628a6084963e215f65c42ae4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=2+bedroom+and+kitchen PDF link annotation
    • http://antonioruizabogados.es/userfiles/file/goboxesolukedelujaka.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c6616382784---4587210548.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0c3897a4c---vexavof.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/93868132553.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/gusedowibiwuriremuko.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/229ed59ee0b117ca21f6083fa72ce868/valedizurejafazijawu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a574ed52cba---23096808039.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082986a5059f---73450429196.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/feruf.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/nelimijubuf.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/81qlug71g1ge0fli4kotomp9hs/tirexetajumor.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/2087422053.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe165be05f7b43543aad48a5d27870c7/29873468246.pdfIn PDF document text
    • https://motiv8workout.com/up/files/25586183110.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098969e235ba---69936934943.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/melizuwimiluzuru.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d5602b44ea8d03407742f9cd457e247c/lomomagifofu.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/20260205797.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/79b2ef5e5cd185d724c4cb1618f39d8c/lamaburewo.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/15934508.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/t0c7kmoinlofpdadko48spf1gi/bafuf.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5d6d79cd19b0adccb7db9b4c7c5716d/gubaguzobiz.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/35423921960.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210619140855.pdfIn PDF document text
    • http://kco.su/userfiles/file/miratapeburazopinularuz.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703fbd08749---56526507935.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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16736 bytes
SHA-256: a15617289c8e8c9937fab8f61c1efd97166880f2bcf55965527f4ec5a281ba93
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 10676 bytes
SHA-256: bbfbe4dda16052c83958e9d657a0fc8c6c978b356e47a7e7132105ba78c01377

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