Malicious PDF — malware analysis report

Static analysis result for SHA-256 753c518155aec394…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 17:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad8ec595adc62099250490d87c2b382a SHA-1: c0b4d02bfc9f4dd5a5274a9c947fd0bdb95a6306 SHA-256: 753c518155aec39410154a1b531bc718583af371087be34021b85eae3191a542
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust through a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8366

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 https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af584188---biwagunefevenedusab.pdf In PDF document text
    • http://ukonlinedirect.com/userfiles/files/3694666626.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/r19ek2tsc10gs31boah3u5f2mn/wizoxusu.pdfIn PDF document text
    • http://greenld.com/userfiles/lafalugulafa.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///15725586093.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/pewewilupafabogiseletef.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/24158168075.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2f65029b1d07f31b0975677c679a6f59/vegukepolupuvabotozojitiw.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/jojirovo.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vaxoxepagiji.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8a26c8d6a46e9f087f4de20c8ee01eee/puxuxukegosojinenenitol.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160edf0bfa5b8e---bojukarewadenilamev.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062606095273499.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/73047571199.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607083e89a38a---34890493503.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/36601325557.pdfIn PDF document text
    • http://aven.su/userfiles/file/rujovusol.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/sisuwaxemivo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bc9997a4---wojuteritov.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/20783005100.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/xatedovojak.pdfIn PDF document text
    • http://modero.vn/upload/files/29461067721.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d94813b0585f600b813920ba624e1073/36229305954.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607373f206bd8---giduxafisojimekumumijewox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ansible+add+line+to+filePDF 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_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 10368 bytes
SHA-256: 72ea8ff3d62a2af7c773abeef0a3c5ea25a65c115e03d080138794239ec4fc88
font_01_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1