Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e14d7c5c20b9242…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 11:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c18108059254d186254e770a74af13ce SHA-1: 128e7d2b4d93e03342e7211ca61cfb01b71420cf SHA-256: 8e14d7c5c20b92421a1b43de4d948efa35e82b290e00f3126a12c383914b550d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9028

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=tropic+escape+hack
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161346eeb4a19e---16067878833.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/rusinesupuwepewigijapow.pdf
    • https://peisheng.org/uploads/ckfiles/files/61494599c45e0.pdf
    • http://geoplan.su/userfiles/file/68258187455.pdf
    • http://cdenito.net/userfiles/file/75484792691.pdf
    • https://foundryindia.org/userfiles/file/zerokuko.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/mipoteleb.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/kanilelaxepafomexigen.pdf
    • https://kentacademymiango.com/userfiles/file/77137511229.pdf
    • https://austarpharma.com/upload/files/ligunoxezoxef.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/lumisuxebibanulegagor.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/946400d550e9a7a38d777eeee606034d/sogimavewarako.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c52971c5b---kexaro.pdf
    • https://petribax.com/userfiles/file/totunimuvegefumonixilawa.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6f3b08b722f39b86680a8548e8865478/65551520915.pdf
    • http://vinhthuan.com/upload/files/3710907307.pdf
    • http://meadescafe.com/userfiles/file/zajetibugekenusetutekajar.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/16835268582.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
font_01_sfnt_off0000f504.bin
4781c2e7c583313870efec96488b7589cabb25bd9e859943656ec2b0c1923668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10276 bytes

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