Malicious PDF — malware analysis report

Static analysis result for SHA-256 03643c2004e3d66c…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf38279044a4ed0778a0b679d438d16 SHA-1: e7a05acf5f432ded6de2219e6f7c17f09d4cc1e9 SHA-256: 03643c2004e3d66c4489ecbd9f6265d2c9880c7f579997a5acbe2c3d77c66d4f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting it's designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=the+merry+makers
    • https://vientangluc.com/upload/files/zanakomo.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/68c0bcec799893fc10e84c1c48ae9d4f/bovotiduzidux.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efeceee4a---91852367531.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb4740b47e---jibobakowikezelesejoxug.pdf
    • http://nusratali.com/userfiles/files/rudodubivuk.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f32f8ce0ff7cdee4e4c03c3b81177446/bigorumirapaxilig.pdf
    • http://www.chatanakonci.cz/userfiles/file/27257132490.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e834007e9aa---69043270599.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/db1a24d2bccf529fd25859644a6e8d67/1451755049.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b3463c5e---fitujira.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/h0rc60ft9jnl9c1n1tf0gobvka/75223091777.pdf
    • http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20312118c---19935811148.pdf
    • https://onlinendttraining.net/files/mimolazida.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u965lalmqrumo3iuu0m0d8ph3r/88058805286.pdf
    • http://cafemsoffice.com/userfiles/files/wemokafubigogodojo.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3s8tieirn7k0039kg21desli9h/jisurejevalitiri.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098edfa07baa---43411488215.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619182356138297.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/38660749980.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb27df243a---23915063276.pdf
    • http://kistours.hu/userfiles/file/togijimulaxukuduwel.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6f95b06b261528bb2e2112b49cfb9dfa/bapoboxibupiwuzeg.pdf
    • http://aircond.md/upload_fck/file/7468256998.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbca9faaf35---sabofokebawukukutus.pdf
    • 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_off0000eb99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 16792 bytes
font_01_sfnt_off000103b0.bin
bf31ab771be5fc4e731ae2b85ceb68d57333c01a6738ec5425c9798ebf87ef1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10080 bytes
font_02_sfnt_off00011a20.bin
b3fd686343a8728e8d7338ad22da1c86943386fe9dfd03c438656dc905a8abab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 19136 bytes