Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa675a1b92c97a5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 09:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2964f01184e8a1464178817fbec9af60 SHA-1: 67fc5fb1fd08b3b4345e9cda16aecea058b869a3 SHA-256: cfa675a1b92c97a594cae77445f205a95a1f5246c75c8f84cdc96797a1f25f9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/89e436171fd5cc41993925c30dc88c27/84556427474.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bovoduxefina.pdf
    • http://inse.us/uploads/images//files/29566632998.pdf
    • http://technoculture.cz/admin/upload/file/55843784834.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ddpelk8rlacuhibhfpt5erlfh/70083849592.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/uj4dfofi2b1k3n5buvm8j346u7/39043272561.pdf
    • http://pappteam.hu/userfiles/file/14914491826.pdf
    • http://t-p-fortune.com/userfiles/file/53763915918.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/30695934083.pdf
    • http://webbuilders.com/files/file/98200720553.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717b410d276---xozarixoviwexidubeweke.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc3ce0d3dc8532e66f5029c926696c71/vofabokixifakoz.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c67616aaeced9c895bdb0cb0b4537074/vidofivodose.pdf
    • https://ph2020.org/ckfinder/userfiles/files/67101841541.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc41575780---fivuxi.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/519145c4d4e77a0aaf15832b3e028b3e/mazulemugebolata.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6nhb4063rcrnpe68g7r2dhke3/xavep.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5a4c10faaa0e5a89cabdcaa6a5b32908/rugaleme.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080620776076---96871077849.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/15420293600.pdf
    • https://rijst.nu/userfiles/file/mamekagakidogaf.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c34149469.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4d0cd94a---junujolukupunefawin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=moderate+severe+special+education
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef71.bin
c54adabefbc1197d6001d5628d2693c7800ef4959f0614730a583b900201f6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 17196 bytes
font_01_sfnt_off00011c93.bin
3d02bb109ab194d0fb016b05051c4856dbd88bef8f1fe9ca6ee06b515428413c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 10664 bytes
font_02_sfnt_off00013525.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 16792 bytes