Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3758818438c80d…

MALICIOUS

PDF

82.6 KB Created: 2021-07-08 01:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9216f02e550af865809d0ea20d143d21 SHA-1: 515e55423b9f0c03f8376688fa3b4d46c08a40ef SHA-256: be3758818438c80d742336989999ed99bc50ff4a2d8e056c199d994626667eb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=manual+accounting+systems
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c022894ac6d---22844565043.pdf
    • https://nanosoft.mn/images/content/File/19295905483.pdf
    • https://next-engineering.com/userfiles/files/5724051490.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb06d0302---78331676950.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fa7886766e97fb33bc91b155a67be6b8/vebora.pdf
    • http://ajivikafinance.com/userfiles/file/52293763768.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/i78ibg3bgj1pc75ki3glp64pin/vizemoxekurupobuzam.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb62bbe6ef---niviwikisobigota.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6261e25dd---dolimuxakijonepilu.pdf
    • https://burgas-remonti.com/userfiles/file/kipiwiviseroxoxukabaxadi.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e31c339af09---bavume.pdf
    • http://baugeraeteverleih.de/benutzerdateien/38854842645.pdf
    • http://bdaudit.ro/userfiles/file/26697294764.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/botezaju.pdf
    • https://ntct.dz/ckfinder/userfiles/files/dagevupugaba.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd900f3a24---xexov.pdf
    • https://contabil-fiscal.ro/mm/file/namulomadusaremadatazejar.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a49809b7014---felupizuwuruvotubodudu.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/88eddtai1rv313tev352t5o1eq/37818926273.pdf
    • https://tekartltd.com/upload/files/xomaduxavowajanajolo.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/dezepamulekikewazufemil.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a9d0df49---vojalawa.pdf
    • https://muratay.nl/userfiles/file/65551418172.pdf
    • 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_off0000e359.bin
c8ede7a90dd4d9b5e82a0169466c2615d99f4cd479deacaa6f30c9ddec23cb45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16280 bytes
font_01_sfnt_off00010cc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 16792 bytes
font_02_sfnt_off000124dc.bin
0902273501044d15f01f93d5e2cd5ddb0f36ccfbff31f228323cca881f60c203
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 10680 bytes