Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dc051452e4561c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07c94497b1c45f47d0a8ef6166594b6a SHA-1: 328358f88817f3dca72790b46f3f2f09177e74b7 SHA-256: a0dc051452e4561c2d2ee80ecc948b873d2f0f3ea62fc3d3850231b35905973d
124 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2226

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf5fbb0a7d---61822449901.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0c2306b097c42efe5f2122fa0ae9ad0f/verunevujos.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/426a4fc34b685a696c1b0430957bed5c/16657831414.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/69097179575.pdfIn PDF document text
    • https://esz.jp/img/editor/files/88704534925.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb3409651---71359406022.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/movikidubiliraxut.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceabd2fcd7---sogagapagopewi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fowoziwuzapomibiwokip.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lubokopozejojilarivafebas.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a299a5bb66---gikefos.pdfIn PDF document text
    • http://elskenecologie.nl/files/31474843235.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kalunabeti.pdfIn PDF document text
    • http://vkts.se/userfiles/file/21203346635.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/71477329686.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/rafowebakonod.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/fidiwimajakolomamewud.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6abb676f2---1033367208.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6000dd3305ab3894bcfe46cb228eacea/wetuzidigizumomibelep.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddc50ded4---98914239555.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/femowodeta.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/55737867622.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/6812931906.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/tips84f8fh73iufss3784tqbb0/dasapusibuvawivakewipal.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/wupejawitifawudelamatuve.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/wizakidopemek.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608defd20c0ec---filudesulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=conservative+party+of+canada+platform+2015+pdfPDF link annotation
    • 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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 11420 bytes
SHA-256: 358acb49f4edfbb9ac83adbde2182ee4902c1f715eddb2afd54342043ed9b7f8
font_01_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 17204 bytes
SHA-256: 22d4f553d934adcc7ce0f41bd5b7029634dbb64e9a85dcd8f7f336c051d25256