Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4c24bdad123d04…

MALICIOUS

PDF

88.7 KB Created: 2021-08-08 11:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca9df8906ddb053d653977d46d86ae4a SHA-1: 23f87c5d9b82cc0a98e45e309c07e2ceec837481 SHA-256: 8c4c24bdad123d0444a3a35d5245ecd8f07791e5a563dba8fbee33b9cd439eb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://calmoinc.com/upload/editor/file/rasipa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9953df661---zilugedotuxefox.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7281abef1a---zesodufo.pdf
    • https://echipamente-scule.ro/userfiles/file/rabuwebikaxil.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/eqotsgd5orvvo4num2rlfqrnfh/4997284565.pdf
    • http://koppeika.ru/userfiles/file/juligin.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i1ub16dhcppmk06pr3qpoqfomb/faguxe.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/00ac6e4633270357df45ca3de3dfbc56/kefigenizisuj.pdf
    • https://anakmeong.com/contents//files/fapuzom.pdf
    • http://sugarfree-gelato.com/upload/file/90371076900.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb95acb36---retituxujopumazolovabowon.pdf
    • http://4998horo.gmmwireless.com/contents/files/gubuluxemekava.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9bagtg8uq3cf17393iird18oc6/bokinoneredegagu.pdf
    • https://foundryindia.org/userfiles/file/39263518300.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3fc6f9b8b0cec07e68d6d4a35f376a85/8069045573.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/odm3n49pf4pf2cpj3trclj7f0a/musixogadumasaremuwale.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/2452536882.pdf
    • http://i-daa-wl.de/userfiles/moxijufugabepuxufuta.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/905v07oj4jo405r85kgr3lcot9/tuwivevuguxopo.pdf
    • http://al-bandak.com/userfiles/file/duzufupike.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/900f243fbc01c4ccf42f7f558ca71c4c/76230585243.pdf
    • http://erictex.com/ufiles/files/venifokulewote.pdf
    • http://frangarcia.eu/upload/file/11856827861.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fisher+and+paykel+washing+machine+error+code+12
    • 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_off0000f693.bin
63b8ed132c68abb37520c58401cf9a2f1812703c465cc261224f3a2c636cc0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16752 bytes
font_01_sfnt_off0001225d.bin
bdbbda4a648ce5a4d215b443658cd0f425df94e747430eb8ee1f249648732e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 11304 bytes
font_02_sfnt_off00013ca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 16792 bytes