Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb164fc8ba205f6…

MALICIOUS

PDF

84.0 KB Created: 2021-06-16 17:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c76803a518ce20228bf4553b27ec425 SHA-1: a4bf6ccb835e971c02ad859be4a4cb2758d434fe SHA-256: 9fb164fc8ba205f68c5250bc01a62e2a98fdba0924687ee3826cda2dd9906c53
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=fallout+4+script+extender+1.9+4
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e373bbfc0510984766ae4cab1f84fff6/72387002619.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b8ede6843c117a841f43f71e18862f12/mebakonalop.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f6a8d6f2---60635006968.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99431176a9---tomajajiju.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e0cf2b21f---nosixogitiz.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kg0gkb0r4k3gq0k38srsfjivdl/figazorobalove.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/dawinikefepufitonijed.pdf
    • https://coonvalleycc.com/userfiles/file/jeruxifakeliduxosolola.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099af4f28284---7042871320.pdf
    • http://yaqeen-eg.com/userfiles/file/niwejekavejesitisu.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e9105180c036e67ea28246add44d45c7/rebinokukuw.pdf
    • https://betenrealestate.com/sites/default/files/file/20895299101.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/lexuji.pdf
    • http://baigeleather.com/userfiles/file/34487446529.pdf
    • https://alutat.com/data/file/zoxadamitiwolevap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000f4f0.bin
26f3a10d1cffbc5478ed20ad517ca312579641061aa9384d8ff0ae6bfcabc297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 5420 bytes
font_01_sfnt_off00010782.bin
a819a5c2263926d0aa1ef2899d009a373cbf497372060a7cbfa30e4903d9b6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10960 bytes
font_02_sfnt_off00012d65.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16204 bytes

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