Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a61fe40f0802d3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 01:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f3512cfcaf9553679f31d47a6ff0c5c SHA-1: f08e571063b25390396ce63f04daac1ffc08ea6d SHA-256: d0a61fe40f0802d345814acf9b5f509e9fe6c45018f8a07fb2d33e7d826e4729
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7513

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://norilskgu.ru/userfiles/file/jiriranedame.pdf In PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/72414033155.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/59018034842.pdfIn PDF document text
    • http://simonide.org/userfiles/file/95606830740.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vilegegi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606deac9ac28e---gemetogozovuvep.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafigoxojoxebuzelibi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/740eaa05801c61c6558629a96c00f221/vukuve.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504155821502.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/39336660356.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/684ed404128fbf5b2b475bca1bf362c8/zamimibejobiduvexozisa.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/40233228207.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tobepiliwokafunasezew.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/60512596652.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/73661476714.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0386802001620224388.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fa50f4ad541e3d863fab7a63be6d06d9/64956716497.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611574bcc1b50---68824120836.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/95523888603.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/didukesiwupezisavabixawi.pdfIn PDF document text
    • http://taumed.kz/upload//2021/08files/210808203638804421j0f6x.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e3d5209e---diloxad.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/64878930093.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/wetuvegipositojemowesuna.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0280aec8---34923086486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+save+game+need+for+speed+underground+2PDF link annotation
    • 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 11204 bytes
SHA-256: b1cdc5eeac48482f29f57064ad11b7c6d077570429324ff7cb4730f4fe0d11a7
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 17536 bytes
SHA-256: f3c7b2cc6d66fcc6b851a1fa4ad289c6c64ee868950aea23c14393302a57fa9f
font_02_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1