Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f3520c8fb5181e…

MALICIOUS

PDF

72.6 KB Created: 2021-07-24 16:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: aada53aaf70955bb93034eb411586a9a SHA-1: a38fa891da59555efec53f8e1047c2de9dc1483f SHA-256: 28f3520c8fb5181ee5331b49f18f79c42c0806a1a4386d51f565b16408bfea54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9238

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r2lgdl9ifhr8ib3d1ng4a4qu49/89313034217.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/71971531039.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/64bfa944161221d7dbeef981d29d284c/digibom.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tefivafedidemu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/17789407087.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kixokeramadeludafariparoj.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4835e5ce---14419389166.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753c74b1599---pulonane.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601214233.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7d63a98714e39f1eea9c4396f978afc9/13836261891.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/99976580421.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4756b4d4160db7aaef1f91b291286cb3/tosenuwagebanifudevitopen.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cd68c28794393771aa1308d66c5251a5/17113136740.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/99254684d3f994d96db9413f0fa28444/gemezomaruwewo.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/gn9onrvsp48ulmia0ia10b0ukt/64684693761.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8df2ae823dc1f893fe7fdc1d09cf5dc4/mazidobisoneperepexubos.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/bunezujofulinedijuz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c68e16a56c5385a9625c73a68da67c9/8099356573.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/kesolotowubosatuzew.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/54743076719.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae3900ef012f63badf569937fb77675c/xinex.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=biblia+hebrea+interlineal+espa%C3%B1ol+gratisPDF 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_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 18196 bytes
SHA-256: 2c952a88ebc52d5c6626f3d610a7f1d5c60cc8635145858c260eb8e621d188d7
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 10928 bytes
SHA-256: f4bce3507a225255fbe1e5a3b2c843c100909245183d67a1fb65e5e00531ea5b