Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c2f9471772655f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-18 19:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23228e6c2e9bf66b418c046573339e9 SHA-1: 72c04cdfe466e1f06bab7ee4f4b18b963a73d668 SHA-256: 22c2f9471772655f24fe2d7f7b18318325689c17b6a2fba19770b16e115cd322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised websites, disguised as a job resume download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=job+resume+format+word+file+download+free
    • http://dancedynamicsla.com/clients/38740/File/98982790819.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f1cf300c---99754540364.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742a139a853---wijudojubibi.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d53d30ce1---85460362716.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/085b5506aa0ea734a07203398e45da51/64703426089.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4870e03d7589a466f3bfcdcdb6c20348/jopesinarawotoseli.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4dc753510797f33cb65d6460b81edd63/bidowi.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/20ac93321ad957e8c090e21159b46113/pogezozot.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/faefe290ed2c62ea35b0d8b8dcb7dad1/47646654716.pdf
    • http://andlupa.com/userfiles/file/lutunezitewiminukif.pdf
    • http://asokmontridental.com/userfiles/file/gepetififugexamobigixajom.pdf
    • https://bandai-k.com/userfiles/file/sodubatu.pdf
    • https://alshaabcoop.com/userfiles/file/29081460470.pdf
    • http://afgventuregroup.com/cfiles/file/96812306998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000eb1d.bin
05f88bfd3df829c8c3f58e95534384089ee63411e4fc396362c4f6f5ea5d678a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5272 bytes
font_01_sfnt_off0000fd02.bin
db41bc71e95213c4da7e632230ddd54a727b2ab9ea9f2d2f7471e9e57d5088e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 11160 bytes

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