Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e8f97e4adab89b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 05:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d77a037504e06cc04870f9a78dca5eb SHA-1: c844ec9991c1ff64c76c74e78472f34958bc4c4d SHA-256: f6e8f97e4adab89b1e4be926919ddf418cb6142bc911b4b85202e16e84f448be
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kosmonautika.ee/ckfinder/userfiles/files/lenoj.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/83ec2d9ed7edf85d710283a7218b05f7/fudujolewuwesixel.pdf
    • http://ersatzmonitor.de/userfiles/file/mifob.pdf
    • http://gsprojekt.eu/userfiles/files/47649084458.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/vebejabipozuvapiv.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/12227637678.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127127747c8f---43896182952.pdf
    • http://chi-kara.net/userfiles/file/zusuj.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/sevifezug.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cdad343d9---sejesexoserarovupev.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/136kt6rcfjvkrpmpl37gehrstr/68699548754.pdf
    • http://jp-photo.cz/soubory/files/81222254929.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ac3043ee---4180713897.pdf
    • http://amandamaitland.com/images/file/jodisavasi.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/nupuwidajuvuleneso.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f133718918---66019589074.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131af97dde70---zafekirapune.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202181963498941.pdf
    • http://leguido.net/files/nagebekinojukep.pdf
    • http://kovacsoltvaskerites.hu/images/file/98199839757.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/daa5145b09c9761bef5283a66e8d09e7/padanegakome.pdf
    • http://gaziogluenerji.com/images_upload/files/sinimupanolin.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/zafuvalolo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=intuitive+eating+pdf+download
    • 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_off0000d3db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 16792 bytes
font_01_sfnt_off0000ebed.bin
e39c7196706c74caac26489f7cd835927ca06419bed1bb758408754b17d8899a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 17984 bytes
font_02_sfnt_off00011a5b.bin
a4099b95baa60c3ef4e019265762b650c998a74b3f468af540560fe0b50e277d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 10608 bytes