Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4ccd7384dcb3ca…

MALICIOUS

PDF

90.6 KB Created: 2021-07-05 13:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96e760a19a6b673f115a2a02e7a12d9 SHA-1: 41e814fa90ea232804c7084e69b10aa8221c49a3 SHA-256: 8f4ccd7384dcb3cac4008ad928a898de001b3e6a6022893e3aa8b51ca44ce718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious content, possibly for phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/17cf6ddd6f38ca4bd37c8bc833054601/lujok.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d71cfb80---14091690386.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/07dedfffd23e63bad621055d119f47ef/88781146698.pdf
    • https://muguet.fr/sites/default/files/file/rutududiripujutanafur.pdf
    • https://cortopolis.ar/userfiles/file/rinamejixagul.pdf
    • http://lhsclassof68.com/clients/73441/File/53211370252.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cbfbbc118661ba00a4319cae10031a6d/83313134283.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bcda014553878b6e782ff97795af518f/mirub.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2cb68e514e859fda6e48c14fba61c6fb/79682120578.pdf
    • http://akicgiyim.com/userfiles/file/gelevokoxezojiw.pdf
    • http://bhhangkhong.com/upload/images/files/xujisuforutasazotaberipal.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a05724a3---worobujurixa.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c886fb6e---83660721596.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530511dadb---544468316.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/i9jlho3uilcagsf7vp2j3hkmsi/36367106332.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e2ae640---vasadejigata.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1fe214ed---32716617330.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/5105472798.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7ac602cd---bonijakidevuzorog.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072423c109df---wekerekomu.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/cimd9qb0lgpocm45knj0m0a13n/51269176634.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bcae34ac---38435346730.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/66948058134.pdf
    • http://gemwishrs.com/ckfinder/stones/files/85737712309.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4449e6dec1---saromelerigovonutelefi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+e+business+models+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_off00010023.bin
8a88afdb2c96d4c42429e144693d12d8bb79647142e170de17dd17dcb440300c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 17356 bytes
font_01_sfnt_off00012d0f.bin
3261d6811bf982b1603d90eede9444c4e15c78fd340397b85f3cf8c57499584a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 10616 bytes
font_02_sfnt_off00014510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 16792 bytes