Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22a26845f500592…

MALICIOUS

PDF

81.8 KB Created: 2021-06-10 01:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af330a0ac74d34b6629b5dd271bff46 SHA-1: 9142a6342aeadcfcd0de7a52cb63d7c5547b108c SHA-256: f22a26845f5005926fe0765fc1587fd8f8469e93948fb04304281fe2c9597aa2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it is designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=singular+and+plural+practice+worksheet
    • https://iwnta.com/userfiles/file/muvajenenovazelajefawom.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t58dkt1h8mjshbj8eqqog8omn5/24783941443.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/27341ac8d0135c1067640ce34ad9d7db/solosexipolesod.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb59a0f736---luxurogerapedomafaro.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeed3cd12f---65148394259.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nipivutobazes.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5a656709---42059370420.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b652721b---giponijopomud.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc16d2afa06---tuzogo.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8f325efdd14e506a3f1b70be39cd2ef8/bujupufupaji.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31660cc81cbf8f90f2f498e1383c6c90/vulimidilubazowavegefulu.pdf
    • http://historia-bfured.hu/userfiles/file/fotojogoguk.pdf
    • http://ytbozhuo.com/upload/file/09123214919.pdf
    • http://unsersohn.ch/images/file/sexovezibadolomiza.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077515267f6c---3860541539.pdf
    • http://ahxxzx.com/userfiles/202104/file/safudoweje.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/kawuponisogavowani.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/79392546782.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0c.bin
2cac67219ef4f82530cea7ebc5185f6a21520056bea4e8ee317eff2153ecd220		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 5592 bytes
font_01_sfnt_off0001121e.bin
cfbc805467a04903fca3349e15ec22cc841c37415a6d50bd65cf5c55bc56e1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 11544 bytes

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