Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb65628fc969b3…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 22:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b0925ded728dd08f7cfae6b9cb2f113 SHA-1: 1739dc9bd8d1e49049b90685ceb217117fabc33a SHA-256: 6cfb65628fc969b3ba4a1cf39001edfa8f07a2edbf77b3fe91ebdb5634b90edb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd8253845e---jijebonuditijoduvulu.pdf In PDF document text
    • http://henca.com/files/details/file/84340095999.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161582072abbc4---samipamadina.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/bajebirez.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/puneweb.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/jirovebuzaf.pdfIn PDF document text
    • http://tid.vn/upload/files/wazujepepikalisemidelux.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/27920901943.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/dimoxemenukud.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/safaloti.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/japukebaxamemunolid.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/59125128828.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/15612952784.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/98001342508.pdfIn PDF document text
    • https://jin-ji.com/upload/files/rofobewovera.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f14efd504b---lupifidu.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/87666376757.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/xofifusi.pdfIn PDF document text
    • http://zenkatsu.dk/files/27086576212.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/73692792790.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fotorugaxoz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d53f2dcea---64331362207.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kabig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=climate+and+development+journalPDF 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_off0000af26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 16984 bytes
SHA-256: a097ffe98ae9391c08471e15826e0daca128a9181c067494484c996a740a94ae
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 10712 bytes
SHA-256: 0a16d1181adb78684e46b76453b9ffdc6da874955d92ae9854ba65e8700ab785
font_02_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1