Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d573d774dda436…

MALICIOUS

PDF

62.5 KB Created: 2021-09-06 10:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab06e555e1e1f0e26ba849760ffb9e94 SHA-1: 53de9ca9b3965722051f933264e23f097413e76e SHA-256: 09d573d774dda4366db9291168d0a151fef7d61cee80017518ecf0adbe418b58
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6412

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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2c3f47f229d90434d593766a07f89cb/63533591578.pdf In PDF document text
    • https://bak.vn/upload/files/83833592077.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39982233519.pdfIn PDF document text
    • https://termoformat.md/img/files/43872366331.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a1d577b7c9007f06c174372c71971205/dosepopesatozumogaf.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019180d2c3---90330905511.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f497cecd---97959767918.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb4665674---1874302953.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/fikixaseb.pdfIn PDF document text
    • http://jfe.hk/userfiles/41086288205.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/niboxemituju.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31urrdhg0b7bfvtr0077epcnul/bagamikavuso.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/12224327696.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/14084118145.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/2383518172.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9c386031442eab507f75a70b1b3ac3b7/vijalin.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zigexunanigutoza.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/5649482046.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///nalegokusuxozojinido.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36de10360---29378679525.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/b75nlsimtflj38tfvd8nj1ei5l/zopuko.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/38115676930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=emergency+drugs+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 18244 bytes
SHA-256: 4501b1819797f388ac73b7d91e9cb3004b99318fb99549e558905b643c8c2c73

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