Malicious PDF — malware analysis report

Static analysis result for SHA-256 836ca6879bad49f4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fffd65ae20f00fedc39306d2cf7c4029 SHA-1: e6585c1d7892d8937277907306eb7491c8705b8b SHA-256: 836ca6879bad49f44ff7e4a5d8a91057f249dae33d63615aeead2bec9bcbc55f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

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 http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c2d0b735---60935054458.pdf In PDF document text
    • https://unique-u.biz/images/uploads/file/moxozelebujojoxovidudim.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rtf7imnlnegqtru3suekl8884k/rafinesilukegasira.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/93706851622.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210620_031923_3210.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/85670305728.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeff7c138---57452027866.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/295019238.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/67686866278.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082adacc0ff9---suxokigenagosodu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bf11c89cfbcb94e5cacb8ee6860dc2c4/20459261108.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/tefumilowukov.pdfIn PDF document text
    • http://wirheiraten.de/images/file/43287359858.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16109b68f1f971---5306125239.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031400463641.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e0da915b29ab6d5b02c7e6615a3bf37c/rijutonajavodeboso.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60960963659.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6d23661e66f8db8732ca2594c9baedb6/94791880245.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/viferirikesusasesikewobel.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/dedufitokelozi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/tumexedemisazi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d6601012---meparumorufiru.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/21048795683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=impractical+python+projects+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89bf0deda---nudofesubodelizafulil.pdfIn PDF document text
    • 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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 11164 bytes
SHA-256: f77a01a532c9fdab349ec3dfbecfa2b495d80b5e40f0ac3e79ee04659ddbb451

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