Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42839d9565d8e9…

MALICIOUS

PDF

83.5 KB Created: 2021-05-17 12:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8460771b5f5210bbcf81776d3b191a3e SHA-1: 4f1d688d3d6ea6b215fb797c0ea1b07ff46c254e SHA-256: dc42839d9565d8e93731b017e450a3a54cfade46030605e1af1060adefb401b4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, indicates a likely phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5169

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=anarchy+reigns+xbox+360
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/db99da7c9a1f41833ca0682583a30a50/fexenulubofapoxawutema.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f196550816---96660785497.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/e8c7a01ef956d3919f85543d6be0ea93/85029709875.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9587aa98---wefeda.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2ca80e2711a2b32110bb8a642917b6fa/23770970588.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1b66d13e---nimirarezobox.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d3e0136ae23c8263e2d5fccc62c0824a/55070179198.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/7cebdf75b472fd36c3b526df4e81fd79/18590963616.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079611b88c2c---94423174420.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac8099330---jepunapu.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/68232500f5a6a883beea9fad0d119314/45424503711.pdf
    • http://ascensionchina.com/userfiles/file/niwiloramelekemeros.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb1323a86c---nobukokaritafemiwetofebun.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/umht5p1bk0h04csoiil1d692ka/dunajib.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pep3l3qjn40tshk54dtl7fov2s/vimowivipowalom.pdf
    • https://ratsimae.eemedia/contents/file/31966496204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108aa.bin
66edc01152c68a708465e0440d7b8662aed002d03e8032be59124e0c21a87fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 3560 bytes
font_01_sfnt_off00011560.bin
1da959eec39de01c78b8506ab9c937c844eca0bd74400b97e27ff1997db0737d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 5788 bytes
font_02_sfnt_off0001291b.bin
bbfdb1a7e998a876ff4380bbb7248bd1a602f0becb6504a1506852bf1c5bcc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 12860 bytes

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