Malicious PDF — malware analysis report

Static analysis result for SHA-256 441450b779a6be74…

MALICIOUS

PDF

102.6 KB Created: 2021-09-05 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98792d357aa197e099114cb76e57f7c0 SHA-1: 8bcc3e1fb9a2b60618457a641900d32e0d47b2be SHA-256: 441450b779a6be74f75a9c3472e52ab99982b12b8bc534195379cbe3a99b5673
124 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to lead users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4014

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 https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bfa7044cfb0eed735890c197604c1b34/riwupomapixo.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f9ed9db9c8f97df200e5c9c57d9f1ec7/49668191525.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb8ad9073---18395709135.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/52244835092.pdfIn PDF document text
    • http://gistys.com/userfiles/file/lodixefob.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/92303702503.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/odp3h48fscdt2qocag6m4922aq/70010977532.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/17649841537.pdfIn PDF document text
    • http://penetrat.ru/files/files/winubefovo.pdfIn PDF document text
    • http://flexa.cz/docs/file/21642253801.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/konefaguviwevo.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/77543082194.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667959028d---91555066598.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf54202d7---64935390843.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/833512e5d0b27b78ca402f9151364da4/11903466029.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/piselepowunoz.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/92547764730.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108081845429575.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d24059f9b1a83a49f553216ac99f679d/71681830001.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5b7e983d---11837562297.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/64628473b279432496399d3c93006771/67407611569.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2c20de4f80104c385c18cc309ba5d7e0/66068398014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=radar+system+design+and+analysis+with+matlab+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_off00016501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D18 11212 bytes
SHA-256: eb69f87fb7f681ddc5dfa016091d2a3ef0886597c12645ee96dca578fb7cc6cd