Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c16b549cff4f9c…

MALICIOUS

PDF

69.8 KB Created: 2021-05-16 22:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bf5e05caddca4eb71518cd9774c47a02 SHA-1: c54de28abc96fef2639b320ba365c701ed203eb0 SHA-256: 81c16b549cff4f9ca72d630e394311e3d4b22d483a38ff54bcc301dfa400b0df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'quotation template xls south africa', which is likely a pretext to deceive users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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://rld-carbon.ru/file/76195441296.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/vewujenomorolof.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wopasuvurazabofe.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/46fa9a937178ef7c934a08d2585d34ae/31268088160.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d718dae0---78005297220.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/83760869391.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/45809579859.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070384aa41ac---polamopajigomirebupo.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/gvkbo538s5q7746000f44o9e9f/tujinoperoxovidurotinuwut.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcff565149---vetavugejadotudugifanup.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/gimaligewilofiparajadesuv.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/runevul.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vg7h6o7u4li3f5j153jf5lc794/96266322320.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e817c30f76e23a1e43bc8bbcb501fbc0/xawivogufuxarotopat.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nidanadam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quotation+template+xls+south+africaPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5384 bytes
SHA-256: 1d186880c2aa96534c4fccde71b4a5c651d2c45f996b3a3edc4af94dd4213701
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10164 bytes
SHA-256: 572bcbeaeaa602ad638f195d4ec427b65cf7b8839cd5253e185e1633f2256c3b

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