Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa26b234265a8a4f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 04:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a801857e13b3d5915c5d8c243a4629a SHA-1: 8ace2cb224d5600eaf4e11787f0c659ea4c311ab SHA-256: fa26b234265a8a4f33eff4b7581883ddc68062d8072e55f61084a9db76f65156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into clicking them, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=root+of+polynomial+matlab
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/jowovufizofi.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca9775ff2---kotinime.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2k393s81u6feulfnsh06c53phm/27883399883.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc6f8de68d6147bec8afe1bc789dcdc9/wumatonodituzin.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6c8a896f---62749887768.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7128bc2c---89237336306.pdf
    • https://circolodelpistone.ch/userfiles/file/81114680849.pdf
    • https://dunaweb.co/bg_image/files/mafateragemu.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/72855609174.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/59394492866.pdf
    • http://ahchala.com/img/file/zewagofefebovegunubufotif.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcb7e8837---66196117094.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/xomat.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df8b7302---mezadokonekefujufifo.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cffe231ff---dufigabesobuni.pdf
    • http://hyundainhapkhau.net/upload/files/1895480270.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b34f7ce8ae4cbfc3548ecd08a2da545d/wisuvomuwuxivapuse.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5b4oss50umfjmv9d8tpj9f48gh/76658984366.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1ee98be9---59356211412.pdf
    • http://angarakshaksecurity.com/userfiles/file/48336474505.pdf
    • http://www.allatpatikapecs.hu/images/file/mopozugerifo.pdf
    • http://atol-res.pl/uploads/file/rekarutofogif.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1f139332bcd8c09545728b071a835f4e/67797253964.pdf
    • 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_off0000e9e3.bin
22ce099cc651e6fc225dc1aedf25072b70ca0fb05feb167b4486b46b1d3ccac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 19192 bytes
font_01_sfnt_off00011d7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
font_02_sfnt_off00013596.bin
89ae5bd2b1ea6919278ddc096c4f504073d776e2128b141d548bec2abe4bc2ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 10420 bytes