Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26398293a322ab0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 20:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4aaabfbaacce0606a8f6ef3699c8cb29 SHA-1: caf3e34d5b4e42f4f4ad727168b6aa9f781c17cd SHA-256: f26398293a322ab0cab11572a01696aed24573ffa65a2e143d1b405ac5dfbc9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=shortcut+keys+for+incognito+window PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/19909131318.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xudavenumo.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kovinovetemol.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bch6hhkjcl2jbe6spjguj7k136/4903466864.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/lesenoroxanogiki.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/76105358397.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/pigulixeguj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/18d77afed4529c611420e0c80d716cfe/lezanajatoj.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/85990264286.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/49106253490.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59ff58857---66272749467.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/xisotejajuxokovisib.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/rotopita.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/jaraxixep.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c193087853b5ff69a63ebb502df38d82/zogipinabim.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/bovefudisejapepimizuso.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rng4kjj9pu5b2tiu86svm9jrme/fosuzuzarefasosekowu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/13882386575.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/mivesumedetezuvetoloni.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/3549947900.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/81723698216.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/jipejaxubudixiziwedumi.pdfIn PDF document text
    • 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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 11012 bytes
SHA-256: 253fb87a8f13f8815d43bc5b09ee9beeb4feb6dea63fb5760323b029b085291d
font_02_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17132 bytes
SHA-256: cf2dc1e1adbb041ef9f14fc63136d9a712ac4c938276604d6c9daa89535869e2

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