Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321f341647f507b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 10:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33380b147db2bfe1a2001321afbae72 SHA-1: b8a6169c48e4ea1666cc808baef8d64a4f5bd974 SHA-256: f321f341647f507b8aca72319fc3d55aa464c78e86570232eeeca935aa992fcc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a high density of external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it likely presents a screenshot to obscure clickable elements, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=visa+card+number+generator+with+cvv
    • https://firsatpin.com/calisma2/files/uploads/kodobifivobepidu.pdf
    • http://timebymtm.com/upload/files/sakexikemolibo.pdf
    • http://ros-grad.ru/fck_editor_files/files/86708361423.pdf
    • https://mrdak.cc/uploadfile/files/71887061236.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/90761936754.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0a650380107a0d3d614a2ebdb98533b7/fubuzafemiropakode.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ab6047997eb7105cdc5d99553fa7df8c/60857531663.pdf
    • https://toscanafantastica.com/userfiles/file/58443532224.pdf
    • http://kryotherapie.net/neu/userfiles/file/bewexokunajifowiwin.pdf
    • https://gulfb2b.com/userfiles/file/bowabilorurefexare.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/64939109595.pdf
    • http://medizator.ru/ckfinder/userfiles/files/modod.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0c651bb4---paxopuju.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/rekopikigojapowuzekirov.pdf
    • http://apexibd.com/uploads/fck_uploads/file/rosikipaxomefelevefed.pdf
    • http://humansharehouse.com/userData/board/file/xedipowo.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/fuzuge.pdf
    • http://ch-bovi.com/upload/files/tozapigezupek.pdf
    • http://yanartextil.com/firma/files/doguxubemi.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/54357f6af8667b7b76cce994f39e99c0/numojomipupemum.pdf
    • http://agroanaliz.by/upload/editor/files/bojigasisavojivu.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/virinifetafebavi.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/3680497625.pdf
    • http://web5gstore.com/Files/files/46078437660.pdf
    • https://kolbandibileklik.com/resimler/files/58026234009.pdf
    • https://northcoteplaza.com/userfiles/file/66332367018.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_off0000b0e7.bin
f635027756cbd064e3af2fb84aacd5c3c5796950a641126435185dcff84ee784
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 11132 bytes
font_01_sfnt_off0000ca94.bin
6f19fcbb2005605ba0725203eb4361af5154d376550f3c9243f5dcc76c0061af
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 14412 bytes
font_02_sfnt_off0000ee5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 16792 bytes