Malicious PDF — malware analysis report

Static analysis result for SHA-256 26399e4150313cbf…

MALICIOUS

PDF

81.4 KB Created: 2021-07-29 21:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e0dac4635fbeda5cf185e8c2d9cf449 SHA-1: 5f6b7703b73e65b6058ef840cfb1980e88d5f64a SHA-256: 26399e4150313cbf35afe7365cc6367de3f563fe76403fef6ab759a3c524422b
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 links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714048ecac5---zadolokage.pdf In PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/foruzomeg.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bd2cb4dac572de88f518561af34bd439/dakanasenizogobox.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d861145a57a1ad33c786889fa51c50d5/josikixojanasu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lboek1trpl0rdb1hdh934hq6eo/kukulupof.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tafegazipiwojip.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2fp98qmu2fcklm7pj1qkjnk8be/35788936700.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/218a6b9259e142215798a11cc9c8fb1f/70573001081.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210726_96D34FBEB468BF7D.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/tetulivofiwugup.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/bixovajetoda.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/67303273287.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/dapumeveribagipikujiko.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/labivawabe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759607ef84b---30764616585.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607898a4e4a8e---tuwanovawi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/67042407886.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/varokavisakafe.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/fazurejuzugusovarugoxoviw.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cb604345---fafipoziwejo.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/91751008673.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da93e42069f---71933656481.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4749735005---tewobobogexotovi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9e0d1d0c---bekavazimawusok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=modal+verb+can+exercise+pdfPDF 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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10816 bytes
SHA-256: 7276afbeb8eb94678b9a3644177e2b7e6c8d4ad810e6d5cb1a3b4316a49b2d9f
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16744 bytes
SHA-256: e18d9f2de15183de011042818050c77e27c28f3127221931ef190a7098d4a843
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1