Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93e1e3761e8d14a…

MALICIOUS

PDF

75.0 KB Created: 2021-07-14 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f603ffb5b5b5e056d3f783516aac0b2f SHA-1: 1e57c2bc46eb9a71edbf5f463896596fe8934db8 SHA-256: b93e1e3761e8d14a37bf773560352e0ec93539abfe2dfb89e15a4581d592b75a
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to lure users to malicious sites. The primary function appears to be acting as a link farm to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8389

Heuristics 5

  • 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
  • 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 https://bibliothequedesarts.ch/ckfinder/userfiles/files/kifuxelekotigeni.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5c5eeiicg7fquong85fmfamiu6/57184759981.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062311164473499.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9a29e1bb---30286611826.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/venixowupavuroki.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237328c64---powagilemobutesofa.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5017ae996---muzuxek.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1dce533131fdfc458350e096613c4337/mijufanonujotirewan.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa40e4f606---27919539260.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/bepapajuxap.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/98f8f866c5e5280c419e13647adadfa8/99178602192.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2d3b3173---pidujafota.pdfIn PDF document text
    • http://renovator.cz/files/file/mumowoxoz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff10905965---45533573703.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/zibawelimibip.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/14291802307.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/pukarosoz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5de3361f---55286502527.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/nne8ef3koiuekbab7u1kpbsvun/medugulizizuzi.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/58122474406.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/59614070872a25812d06631e04370c3d/86239484626.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/golututoxikefipemafakukuv.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rigolamabu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rigapejofagezunufe.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/12582182606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=type+of+reproduction+in+mitosis+and+meiosisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10912 bytes
SHA-256: e1bfaf7ec149aed59c3c217db0c8b01385644e58c6ec55d6104fafa6bcbc50b8
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16596 bytes
SHA-256: 33f5febf2f9ceba98ecbae621761daa4e8e529359635a64376ac60fc5aaddfe1