Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b555dacc09dedf…

MALICIOUS

PDF

58.1 KB Created: 2021-09-02 20:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d4d26fe44c1308bd25a3f65aaa4bd55 SHA-1: e9a274340d34f9d2b3dfda5f1e4f3c4058377c2c SHA-256: b2b555dacc09dedfeaefafcf1e1a656112db03234a8fb6615394d4843faf15b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df432bc496---logisosixikaxi.pdf In PDF document text
    • http://associazionemillesogni.it/userfiles/files/zisinufunor.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/xupanedevorinu.pdfIn PDF document text
    • http://skomi.ru/img/files/file/37084178937.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d2e739f32773b455aa7fa6902af8c0ab/dorufenugorokunote.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21ed0873e54031d0321538450ef893cb/totolamisubizozadara.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nisr4cs0kajl18rqgek2pviar2/42224804698.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/76rqu7589app7gjd0fqfoinbei/46025831137.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/30753067855.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/67608679619.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb2f997d0---10153609974.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f9f710584---19326555514.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xoxuje.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5fca800b---bunitijaxat.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/371a044ec55af06f58e0cd2fbb831369/subanokakilawevenawuwet.pdfIn PDF document text
    • https://12shio3.com/contents//files/11072971762.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/62564514075.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/xoseritobotogora.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/72db8e68672fff846b80a0fbbceba8da/gutabadufunibotuvaroden.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/57424679105d4176b4de33bc8b7b8d3e/47963477515.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/65688167492.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2leqa9c4c783foeoc2be690jj5/25705169840.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/52772640812.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pojikaxifemixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=alcohol+use+disorder+identification+test+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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1