Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f21c5964423ac0…

MALICIOUS

PDF

78.1 KB Created: 2021-08-16 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c1eaab4eecbca6448f0eda92ebdca00 SHA-1: e42c4ac1d05361dddfe6147a970548ac4a03bc83 SHA-256: 75f21c5964423ac044efb53c2399190d75e57ccecdefa123fa08c74379b77994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9592

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
  • 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://zetrade.cz/userfiles/file/50363807555.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e4222da3---98397381258.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0c296301332967763ea11c348f4111d2/zovemuxizuzifivanuze.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ck90tfoi12nt3kgpuhrnd4581k/71484557655.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/xinodel.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/57542862570.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1ln7vss42g71iqg0h7lu96j615/9253780271.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/bupokorewixatigerevonid.pdfIn PDF document text
    • http://amdind.com/userfiles/file/35807465209.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jgrfqsgoidinffje477atjj4ve/59385946618.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1e509c7a---xuwono.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/verif.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611757fb47f61---tebujapokipejemodiko.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/46892151434.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/22533382529.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/osgs4mqbbohtek9actl7pnqoaa/87213067079.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/st3acs5tmpfaptlbo54d3ns252/nogukenigonatezedubagiz.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/95988576555.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/34338278102.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/rizew.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/61748050438.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/sadul.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabf85c734---76261501233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+a+cover+letter+for+academic+journalPDF 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_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 10840 bytes
SHA-256: 26f9488956f616fafbba4fbcb833e4c5a056c990c5ec98bd9ebe5b030fc0726c
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16680 bytes
SHA-256: a8bf613f22ec03775a0c609df1c1aa4eb2d5b3fc532ff03982063bef87f90972
font_02_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1