Malicious PDF — malware analysis report

Static analysis result for SHA-256 105cbcb9159f72a2…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 13:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2c70c47fd94926d2bd5321ad209618f SHA-1: 947cb4e51dd3d5d83aca5ef3b27ce00bf4fd6fa3 SHA-256: 105cbcb9159f72a2039afd3bfb7a24e2ca7d5b1c609ff8cc4a42829490d09d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, pointing to compromised WordPress sites and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://grupophi.es/uploads/files/5804836502.pdf In PDF document text
    • http://kkagro.com/media/images/upload/file/58735317932.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/17902966714.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/sutefabonu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/50511009734.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/wikiwepof.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/573038ea3770ffd951d26b513d9b0a2f/ziketotikowalo.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/murudojipokonodisok.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/nesigojelagifesazusapugin.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/piforasafugit.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/13434326320.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/36871016011.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304e0e7ea3c---murawuvojevi.pdfIn PDF document text
    • http://talesma.com/E/file/61825458346.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210904013158141.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59702490996.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/24111344631.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1e344cd0---91122151194.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nimifelupokev.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/88350544008.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/86867524033.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138d05435166---mogegifi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f9eaf942ac25f03b0cceecdb2603a223/63276057451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+home+sdkPDF 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_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10280 bytes
SHA-256: 7050f12dfcd3d332e51ef173d3bb4480c1be910281a3d8a63dca431f152e9843
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 17892 bytes
SHA-256: fb1c8a622b7af42673fe8afaf3f945399c816a9644e8e6f1adee0d91f4da669d
font_02_sfnt_off00014205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1