Malicious PDF — malware analysis report

Static analysis result for SHA-256 629cdba9cb02339c…

MALICIOUS

PDF

70.6 KB Created: 2021-08-10 05:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d040913579f8bb8ba3c1920eaf5bbcc9 SHA-1: d8665dd0640d731756af6cde60fa13d79c6c2313 SHA-256: 629cdba9cb02339c4dbdefae9c1201fbe057ca11589262361e304992741f0318
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5836

Heuristics 5

  • 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
  • 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://www.stadion-zarya.ru/ckfinder/userfiles/files/safibideloliregofep.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/taxewapejujidunuwipifog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d09loe1elunbdu089r39oeluk7/37991062144.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57ca951a2---zedugoweje.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077abefe83ea---35392562948.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/venefikilofuradowosivugaj.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/denaripokasoremamikemixud.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pijumujuxi.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/79342073403.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16103dcf4a23d5---25390685824.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/14873613499.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/dumeradaleworupa.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rakotunabazufevo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/balipemitufad.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/2554535944.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42783399196.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bc71b65dd8a9e3516288bc0099ba8302/74084140528.pdfIn PDF document text
    • http://sivam.pl/files/file/5314653910.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097b92c152e3---37356821517.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/98942260658.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wijalupadaloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=amigos+para+siempre+free+sheet+music+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.pdfIn PDF document text
    • 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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 17716 bytes
SHA-256: 84bd2cad0f5ed4e89d3dd890e1f85a8ea568c7753e0eb663d674b588dc8bdb65
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 11000 bytes
SHA-256: 4713e1ad98210dc5fee46581396309f880f800c7419d1a6b69aa322950854122

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