Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1ae1667a4f9f0b…

MALICIOUS

PDF

82.7 KB Created: 2021-10-19 11:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ffa11df03eea9bca0c9ac7a508d74a4 SHA-1: 47afe6264ef11953c26f49a021feb1f4e0e49f29 SHA-256: ef1ae1667a4f9f0b9dbe28213e57a04bc6eaa5e6fbdbfc0226270e05c6d6c843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The document's structure indicates it functions as a link farm, a common technique for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://archism.ru/uplcv?utm_term=3+ejemplos+de+electrizacion+por+frotamiento
    • https://dorfadvertising.com/ckfinder/userfiles/files/dewexonuforab.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/90109372546.pdf
    • https://ecotranslation.ca/upload/editor/file/6928154415.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/153f65367e512ab38aa0387cf2740491/rabebusufufew.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b2ed1ec0---97399212795.pdf
    • http://gniortho.com/files/Upload/file/bimetugazumurowibugu.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161392ad2bcfb9---pipunatidilatidadufek.pdf
    • http://tvcsoltau.de/userfiles/file/53176731063.pdf
    • http://nationalherbo.com/userfiles/file/xopurometezekoxekenuwobu.pdf
    • http://creative-format.com/upload/editor/files/68043233155.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/muditujiwebitoliwunazafed.pdf
    • http://salkim.com/userfiles/file/sisozifenutiko.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/gezapuxal.pdf
    • http://sunnyten.net/userData/board/file/debumi.pdf
    • http://studioindelicato.com/userfiles/files/baxilebu.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/lifosusajezipa.pdf
    • http://thanhtindesign.vn/uploads/image/files/xusipebosi.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e4e4d03095---danog.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c24f38fc5e---25055955517.pdf
    • https://tumujerrusa.com/userfiles/fuwituzag.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/junas.pdf
    • http://binhchuachay.info/Images_upload/files/nodenifelosuputuwumatafaw.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_off0000d8d1.bin
f4ed92b7c02efa68604a98ee9a55609ae7d5910823510d40da092ca9c8200483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 11044 bytes
font_01_sfnt_off0000f27e.bin
a8b6a19edf3f08e1370668f051efe5b33ee4c44598a4c1f8009f5fb5afb4fd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 19680 bytes
font_02_sfnt_off00012369.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes

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