Malicious PDF — malware analysis report

Static analysis result for SHA-256 c366c434db5cb12e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 09:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20fe34325a9b28ac87f072ed97d5db5e SHA-1: c4c059e3de760f01e303005b3bc5725da24165c8 SHA-256: c366c434db5cb12ee5606b21fdc26307315bce412becfcb44b03290a427b5552
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF detected as malicious by ClamAV and an ML classifier. It contains numerous links to external resources, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vmwarts.com/ecovic/file/28772517472.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/30085779633.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/fatato.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55c201a77---vamenidopavasisotiz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a22f0e6c3---60278344725.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/ravoxupasuf.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/lukalewebokomabir.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141106fae45f---miguwibidotoveposob.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/22134652150.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14303934326.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/vezaxas.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59d6d48e0---xukuzi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5388ac8---86312635184.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/bopiruxaforezijavud.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/63436135082.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/digutogotove.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/goniduzikaguwazubaw.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f08247e75---69835335617.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/66870078438.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/tasesoweta.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1972c628020b8d3a7b41cd592451eea5/movofaxejutizu.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wovewugapajuwusawawi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25209277790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sabrina+full+movie+2018+with+english+subtitlesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 18072 bytes
SHA-256: 1314626ad3c4b92afc66cdf9904455117752e9c838fd6ca6a35a5d11e4d3d915
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 11632 bytes
SHA-256: 6e0da15b90a7540439c37ed54a84accacb4595c52e893fcd319c42f4473e1fc0

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