Malicious PDF — malware analysis report

Static analysis result for SHA-256 4534c11a095458ba…

MALICIOUS

PDF

76.2 KB Created: 2021-06-17 22:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581a6d61ae2153959173d34f532e06bb SHA-1: 691a18f2db57c099a46d15684eaa0efd9639a6e2 SHA-256: 4534c11a095458ba84309a7e5bb6b463d4713ca642fb49c8740d2850466f8f57
156 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, indicating a phishing and potential trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body contains metadata related to its creation, but no direct instructions or lures were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d341b4abaa0b36cd49395a45a027cf69/77147223477.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a5edfa51---pezenipujulegoxupaxovowi.pdf
    • http://nakajima-ya.com/upload/save_image/files/gozukepajuneb.pdf
    • https://artbynela.com/uploads/file/wujifim.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f4dce22f---69012386749.pdf
    • https://suma.ca/upload/editor/file/53994769271.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2769e3471b---gujepisovipomedalibitusaf.pdf
    • http://msamerica.net/clients/873634/File/pomigitekezi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc105d920---99484784236.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096617b1f411---gekufedugipovox.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd10552d21---81743973488.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d594b3ec457795395f3bc8cde5308762/tulazavug.pdf
    • http://flomojapan.com/upload/files/lamilazogofumelel.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/q3oi01pq57hbgkoufnjm3astc0/bodabukesubusugulatova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=shl+inductive+reasoning+practice+test+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab0.bin
3d2a67b1c020780886fe915b79f4de8388875a74eb3fc9866e677eaf762d35f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5588 bytes
font_01_sfnt_off0000fdc4.bin
d0ab00c681de460069d5fc3082431cb6c7a4f74fbb7072522ff5070bce70b451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 11096 bytes

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