Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae6b52fe9ceaf24…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 07:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df3b12150e3115bb4315c451cc5d9c4c SHA-1: 728be47a6cb2f94448fa35ef41aa2dcf3378142a SHA-256: bae6b52fe9ceaf24929961e2f9acb619c874552cec56d48704a41fa010d83e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The primary goal appears to be SEO manipulation or hosting phishing content, disguised within a document that likely originated from wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c34699c4bac95970cef700405e7322a1/8042617396.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e186e36668---wupogajudupuworadezeruxe.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wizasajopifuvumez.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/19276551823.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/14354711190.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a4e8komgqkamnmmms8hg92mpko/zatamazebomavorumezifemo.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/dugurexilusizerazup.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/96463808552.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/80086265932.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/45114499922.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/viletujarir.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/ridipijimulujalexemasu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1322d0379---58415200765.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/pijigusumonelarupidesa.pdfIn PDF document text
    • http://rhondachem.com/d/files/16867344410.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/boligal.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b354de---roniwi.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/niwavag.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/posej.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138654834bc5---luxum.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/99337081595.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/62148388180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=psp+game+iso+filePDF 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_off0000ae07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE07 16568 bytes
SHA-256: 687e5633699c60b13cb5838969af5de38ebc35ebd6c66d5189e0e7fac17a1ce4
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10400 bytes
SHA-256: 3f6eaa103d72df37dd9ee62f379878b39fc2258b037f5f788810c56bbc671577

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