Malicious PDF — malware analysis report

Static analysis result for SHA-256 55915aa2f66a32c1…

MALICIOUS

PDF

53.0 KB Created: 2021-09-02 11:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 069d0f4a6dac448ed5fac6ab41d94310 SHA-1: bee80c548a4db977d90fe422f05d378a3d72aa4d SHA-256: 55915aa2f66a32c18248c1c0890f19f7d88991b1f41dd1e289eadddd5853dd93
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV identified this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4394

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://laborke.ru/uplcv?utm_term=polyatomic+ions+lewis+dot+structure+worksheet PDF link annotation
    • http://cuoredicane.it/userfiles/files/megixe.pdfIn PDF document text
    • https://wecareprogram.org/images/file/xajopirakefe.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106210144291314229lfmx1susnb4.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/segamatulorakipanamina.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/vaboredibusorubupixijenu.pdfIn PDF document text
    • https://petala.gr/userfiles/file/kobuwunif.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/84408469447.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3eaa97a58c952e3630d8a448a126dbc7/jiperesupufi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/38179701594.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1104bc14777566c4dc9beadfc00c252c/73351439976.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07e7675f4b2ebca84829a3866f4409f5/51046978298.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u6to0utoj2f2q7uls99khk2mhh/70484728651.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087905c03ebf---pumobewuduzafarazum.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/29867834072.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jimifibevobireseziki.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pm84lvhnlu6q8lssuc5sq6f97a/bevuvuruzomi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160887c8cc027a---25000574967.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/rajijetepopazexanovujefof.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64489b3a02---43087608646.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xuvigaraxix.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/xonadajololo.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vilamenujugopitagupa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jekapezatijotopovi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705a5e58db---98837664489.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29be0909c---21438114028.pdfIn PDF document text

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