Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca080bd96a8a7dd8…

MALICIOUS

PDF

77.7 KB Created: 2021-07-19 05:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04ef652c2928235ede7a8328b1b0fb90 SHA-1: 83017a11f90f23edf5b3c156387ddd8e00ab10b4 SHA-256: ca080bd96a8a7dd8a0ce1a7ce78ea1d65bc2b19373717d2f0f1c2cabef0a56c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it is designed to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c53551ade47---57056716123.pdf
    • https://kopari.hu/files/file/bitolafi.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079796997a04---garagixobe.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3dfd28a4---75874524422.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/20eeec0025d3814e2c7670e82aa74f7d/jodawemiluxijudelovofexu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608681e553d80---57466023208.pdf
    • http://aarogyamedico.com/userfiles/file/47668394160.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4b9420c2---54199946690.pdf
    • https://szud94.hu/img/sajatfile/files/miwugakevarukutixe.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t78avk36185ov5r61ucgecuo5n/jawolejumedilewat.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2389e256---8937072937.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/42fc6ddbe7bc28ea25ef9c80be132ea1/lukajo.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mii06se9i83f5j3s720out96gq/20347999071.pdf
    • http://allprintusa.com/admin/images/file/libedazoserinaguxo.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79e539f4d395b2bca7bdfbf7a9d77f43/xamemaziwuwimetepasizumuv.pdf
    • http://burchiellati.com./file_fck/file/rexakusob.pdf
    • http://narnivet.com/userfiles/files/narujiles.pdf
    • http://ingpoggi.eu/userfiles/files/konolowujeworipeje.pdf
    • http://nandishoverseas.com/UserFiles/File/zemomagokoradulo.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/87889893245.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2142509147---74215924818.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607502712c646---68881013892.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vm9k00gpln05v9g9l749ho67f7/rafukafazajopisomiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fast+and+furious+6+telugu+dubbed+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 16792 bytes
font_01_sfnt_off0000e403.bin
45245451616663029183cdba5921aaf15662dde9f2efb91074627dddc51e1f87
pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 11148 bytes
font_02_sfnt_off0000fddf.bin
6f5a571725a8763c85f37c0b4579c7f188608768e4263d7fd9fe3c560e36a461
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 16704 bytes