Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4e1f0adc160074…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 07:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce515d08fb5671346cfeb0a60e0178db SHA-1: d7ff011e8ef536480ecf4bbf070b7b7cefe1c80a SHA-256: bb4e1f0adc160074ba447dc14538315cdc21cce2ca6094765e438299860f2fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using a document to funnel traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://irlanc.ru/uplcv?utm_term=export+pdf+to+powerpoint+acrobat+x+pro PDF link annotation
    • http://bbmeti.it/userfiles/files/fogodovavefuguvegojotagum.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/66949902738.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/jaroxiwuzume.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/57635906091.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/11131951943.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/57177137194.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/67014293940.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3203a5ec41a98dee528b2bd28cd63788/99819620808.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vadupojuzemajas.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/rusazadala.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/11743946746.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7756384b6f---60236335021.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/04ebsnake5r9ve77i69a4r2ho8/dizagoguruzazeniwerowuv.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/76160054177.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607339c4c02c2---62732346363.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/12449183024.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b871416fa7c---folozufikoxuvuwobas.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/50783174211.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9d7u2adrt018bv2i3vs0o82fq0/2288103265.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/ramasogugixomijogunolomi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tewarag.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/54364669733.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db655343e---xumezunupajapoluxebe.pdfIn PDF document text
    • 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16376 bytes
SHA-256: 8bc974f919ef98de75101536bf59d4af66997ee1752716f9f67d7aa6d3b423de
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 10708 bytes
SHA-256: 144dbc4e02b4e10cc77f56f2950025939414b93305a26db23977f849967bf58d

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