Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4a7a8b1c93341…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 03:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93cb585100e24fb2c7c25685ada78e6b SHA-1: 0f03598ee69ccdee19e008c4a7b0e63852dddcc6 SHA-256: 75d4a7a8b1c933414fc3a2274e015a2b24ec56b3b5c0dd8ed7bea7f884e010d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable or potentially compromised domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mudraconsultancy.com/uploads/files/gabejamopirudovipunaj.pdf In PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/7598438417.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/60980996181.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/zeguzogepebadenepekon.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/21121923677.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/8663200154.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/takelisomiripetaxuvi.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/femasoruzozok.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370ccd78d71---naniloseneguxuxigisifine.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/fajixam.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/34711899574.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/lutegesi.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/76854134804.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/56917190835.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tozow.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/71604029235.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c2b299dde592c3849b0736710849222e/bikiwa.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/16444765286.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3efb629c02c7336f8c45f5e568fb6451/54757863277.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6jq7sb805kn723dbhqi85fudfl/xabofebarigokomavezisat.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/bolafabezowaniw.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/nopatenosokumo.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/50197745740.pdfIn PDF document text
    • http://bubb.cn/up_file/file/zapemaxoja.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/kewobedodudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+cast+from+chrome+app+iphonePDF 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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 10776 bytes
SHA-256: b7019c756a439151e01318f3e83a86914b7c89705d377e739f1defd8946a726c
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 16488 bytes
SHA-256: 2e49e8ed3557bbd517847c5865c04ff6cc2033d950b7acff0e2831433f9cebb6

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