Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8bae4a9aa958ce…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 01:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8597184690dc0ffc4c7aceadc0f6d30 SHA-1: 52388fd0cb2b4e2348195ed407ca6a2fd45ce51e SHA-256: 8a8bae4a9aa958ce073b634202549137f6460c57f4b827e3ca2db6ac0e32fbba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca53a2ee9---belokiruluzafunusumo.pdf In PDF document text
    • http://gdbchurch.com/clients/43262/File/tixufixagape.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ql7nntp1f3ioqo374m2mootc02/fojadu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b27261bd---67501088732.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/5422613492.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/83750324696.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ae5300080a1799d07bd70c2f4497c527/giroteregin.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dorop.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df28de48a67---49610549058.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/potujopodexetovi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/xuzoxilesafamorefomakotaj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f608fa3c---pobebu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a787bb16ecc---lulaxujop.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/cn1ki1hui0c755vv0f3tdllqq6/pulub.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/da0aa7cb2fcb34f8fcb7fe0a707d71dd/zegisotamivomisononese.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/81098801349.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/67530231007.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/74567693419.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vibikefub.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/85ab535874adb860c0d0d12e098f873f/45565790271.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/88452846052.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608928d37bbed---depuwifuwa.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/gafeve.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/879a526bd63d7c5c8ee0a739922fda5e/33815913458.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ced26809e---66463843319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=30+minute+timer+stopwatchPDF 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_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10976 bytes
SHA-256: c495188bd93312e55fe9db231bf188fd1b455bb5f0d7ea180bd0c77b2f269908
font_02_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16688 bytes
SHA-256: 34a41c0f527b31298d50798bfb7566fd7a852adab0f406cfb7b271c60b4ee27d