Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a76bc8ae50d3274…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 17:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61c79bd50dcbe6712d1221c1b1376fbb SHA-1: 0e02d96c63935831dffb7e411289e8f2b47d6319 SHA-256: 8a76bc8ae50d3274065234e8c0a6a3feb4026a4b730de7b3942a90d986cff0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The PDF structure and the nature of the embedded links suggest an attempt to exploit user trust for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zerosquareonline.com/file/rupanabivapefikefa.pdf In PDF document text
    • https://langumeistras.lt/i/File/90651746741.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7j9f5aib3pu8hhmutnt5o3mgbd/93122889540.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9383066d4516f350d7eb2f31cb538432/33127967259.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9l8k83m5butqeak6fh4bgtj9m6/jumixebitexun.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf9913f27---18087863658.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070211034847.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e4ce52cff5316c5290b85e95c9812de3/baxekubexovaja.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xupisevatumubozegizopokuj.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/66160257064.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9c37042d90c9a4419a2a638f2194cac0/95460149375.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/614c8ae5fd7d6d2d749e584da7d5ecc6/jogufasumu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed375625b9---sapakojufinajojawufibalo.pdfIn PDF document text
    • http://policylic.com/uploads/files/63471880332.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3f743d36d9cd7054825af8f762c45855/kowixo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5eaf6e---76119842914.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nejifokufaren.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608561e96852d---96360269288.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/694de064f2bdc7868500a637f1837c53/sixoxupogipajokevubogolu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637340a8a1---41474706562.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vizotesiletevivejuvuv.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/detemurazuvaretotodix.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/49688368970.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b16061e24ccf731439acb96636dc1a77/34484025010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=effective+knowledge+sharingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 18864 bytes
SHA-256: b724e3a9fd245925ea282fe09137317ba3baa24de31533caaca9ec47c4d3ecef
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 10984 bytes
SHA-256: 7ea1420ad7ed2bad8c48413025ad911428242d2bb128ff1f450ccfe8079aec2d

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