Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f84da9cb9b451e7…

MALICIOUS

PDF

67.8 KB Created: 2021-10-01 03:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5622ed22d000ad4b4093111be70d7195 SHA-1: 9d9694b62d1e28f202df601710eb887da0dbb7d8 SHA-256: 9f84da9cb9b451e781b6cc8292aaf986f281143dfa0518e53963c83c5a217314
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, suggesting an attempt to obscure the final destination or leverage legitimate-looking infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drironcat.com/images/file/54316774583.pdf In PDF document text
    • http://saconsultancy.com/userfiles/file/jakefelekabumid.pdfIn PDF document text
    • http://brlairport.com/images/file/54444276446.pdfIn PDF document text
    • http://honghuibio.com/d/files/zobuje.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f01583770---lujozoxinudumojamawovi.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/mapepitafediwolugaw.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/dazekoriduvo.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/44172134908.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518334ab48---jidakifi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wiperajumajixosarorij.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/60111471392.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/99278095921.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/50565615060.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/14360a93cd7df94f1732763d6d588e32/lizex.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/fuwetolazinexobezatelunib.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xexibigonuxavopab.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xixipitofakororimud.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kefulatefovejexub.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/digobejid.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16151a0f76c857---navuburidaduvidazuf.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/32652189876.pdfIn PDF document text
    • http://sergeybazarov.ru/file/wulaxikowoxa.pdfIn PDF document text
    • http://licausi.it/userfiles/files/19667351854.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/59980399433.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/bofufopabugarep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+amazing+spider+man+1+123moviesPDF 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_off0000b635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 19700 bytes
SHA-256: d7eb5781c88f239b0a6c45c5fb00dc5d20ed7d5e43611917f42b70692918ce9d
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1