Malicious PDF — malware analysis report

Static analysis result for SHA-256 8418d685fd32790c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 19:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f81084f90915105e549c1ba38afdda56 SHA-1: 0b1bca8782c19e2a6bf6f3ae4f4bcd9bdd6c45b9 SHA-256: 8418d685fd32790c487564012bead3b1b218626d0e6c26db9066d6a65c9b90ae
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the link farm structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

Heuristics 4

  • 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://nothingbutsafetyglasses.com/userfiles/file/nilopapipukaton.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/87271783277.pdfIn PDF document text
    • http://screen.by/images/file/18367785281.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/76534063063.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/velevapivoxijawomizoku.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/300a514804b589c728bc0ac13a283545/99124875027.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/garorifufadesuku.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s9ljsbpsbkf7dnqg1l2pbcdsdn/89479847072.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/63805975056.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/da1e38c882dcacf8a54f520d156361d6/renedekejakufevixaba.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2e69e2e9b6a2aaf94dc00f6e37cf873b/zisuferizegoloko.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/degukewenovowezazolu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e0282926---51954298021.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/116b83f2c071dba4923dfefdc67e8517/vumebidet.pdfIn PDF document text
    • http://polipack.ru/content/file/wemapa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d67af4687e0---zegapowajoxalusis.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/35430422334.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/e2gf4jioh6s4tkdeon81t0q5sl/35636725409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pre-experimental+research+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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 17244 bytes
SHA-256: 215da641a6e211f0e9a92e5be8c53cc46ecc6554e36578a16bb99e33423a8e92