Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3479645ea3d3daa…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 13:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbdc3053c94a83ab1288f08fda3c2e26 SHA-1: ff6396edbd694e23bb48b7fa4f42b1ceca91efb6 SHA-256: f3479645ea3d3daab13ef595061e9647cb525f45ee02b4cae89233b2ad8e41ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=arijit+singh+a+to+z+mp3+song+free+download
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dojexasoserowi.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fdd99fea8551136689aa8b8bdf196f8c/jifefitogarim.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4695d73a6---16011020408.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/latedexofubotezivujun.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf040a8f013---15827304056.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pgre7fhpicgv2389upjtv7g4dc/durevomuxesur.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16077bab05b55a---kiset.pdf
    • http://aimic.com/userfiles/file/rafipodakenobu.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9e8862152241ef7d3f20408fbcb24ded/jelolekavosejalufuz.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d20ecaf9e---pemexawumelipege.pdf
    • http://kompletucetnictvi.cz/files/file/tobumukedulizemogemibafis.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070785ddd06d---pivene.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160709cb672b66---niwisudo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bfcabfb5---niruve.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707409c2622---47057027082.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/zavupolemizesa.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_off0000d5fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
font_01_sfnt_off0000ee0c.bin
3ad70cff28e58e6695514b48b3179f2a0cd74c16f1b48f65e01ebfe1e3afb215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16724 bytes
font_02_sfnt_off000119a4.bin
192f4d924d1b42684b750b9b365434d0265457a8fde9c1dfffa1b9008f4ab4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 11376 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.