Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc2f3635be97099…

MALICIOUS

PDF

84.7 KB Created: 2021-08-26 01:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eeb27fa845ed51bebf9459a151121c7d SHA-1: 3bc399841abfdad45a54d34fc702a26c13fdbb27 SHA-256: 1bc2f3635be970996be40bdd89d1f11591bd4ebea22590d0e6de7b89cbeb2a11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/uplcv?utm_term=classification+of+business+activities+pdf PDF link annotation
    • https://at2-turbo-j3t.com/contents//files/64837356967.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/17351752769b9a3c1ff82bfbc3a9a765/favorab.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3jc74e577js6c2mke349f4v9p0/8905307030.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/zujij.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/95610082241.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ji8f4nt9duvquepan2r8t22ta/82891034046.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/bozunaj.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27613186077.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oh0638antcauja49dlanb736e0/35854109004.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/zojemogopa.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/mumemexufavej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4a0e765e4---keninajodigifiwev.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qnibjlddm56e7ikma0se02uj88/wilajoxugolileg.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/genigufa.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/13550566768.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/52820532778.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a20f53762bb9b21c6fdb32d7da607e74/42645674002.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdb75c9c66---42321292404.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/godipizafebiba.pdfIn PDF document text
    • https://gangnampools.com/contents//files/75818577210.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/275d29506579ec17d850d34ac1daaeb9/jajunepafute.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/40204415257.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/34222824352.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5643e8d2314d1d349910d1d0b746615f/numogugitederiwi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gipukepezijevibamexito.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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 10852 bytes
SHA-256: 7f3c6f791e44b970f57d21a579bc0b33aff15d5e313cdf89b568f3200275b3a1
font_02_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 16480 bytes
SHA-256: fa7274a9163174740b32ef375dba37f74696b167348976a2efc955c13b2f4ea0

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