Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbd436f355e5374…

MALICIOUS

PDF

96.0 KB Created: 2021-07-13 03:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d61473a4f28f32085adfb7d7c4c92ee5 SHA-1: e059a91d96f8f07e82a68177f97041e45d51e39b SHA-256: 9cbd436f355e5374be94ca22905f1811fd571c15d8c72cf2ffd51f6ab0248b5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it is designed to lead users to malicious content or further infection vectors. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c364da60ed1dff7a2afafe7094ce69fe/jujalazujopawatasona.pdf
    • https://brahmagnanam.org/fck_uploads/file/wusos.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086faa712f5f---8448089646.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609022eb346ac---jiwujinizi.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/35098933845.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qc8t44641ffppv3ui9mu3kbo31/69858086854.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/h0omha0h8vic0q5b82isk8tjc6/zomuribevujo.pdf
    • https://gachbinhduong.com/upload/file/84493469052.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9e01b0c---23280260965.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847f4112649---15342658080.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608aab4cacf9b---fojenixap.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/87dd5b80dcaff55cf39d84e2ea487186/kiviravusezarepugexekulev.pdf
    • http://sacoorhealth.pt/site/upload/file/90006289627.pdf
    • https://korovin.org/site/img_ufiles/54749753045.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/66709951793.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/90266203297.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/40742380850.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082219e886da---bunaxime.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ad9b9276---kakiwevowivifoji.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4bbcc9a3---69924403826.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m3aa6dqm70enk2rn9h0damu7f3/64083370724.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc4357e31---18517249599.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=most+of+the+weather+phenomena+take+place+in+the
    • 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_off000114d5.bin
f3262e0e5d269a7ee19e5e4f2bee283004db98af4106f1a99ad361baa5b9b159
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 17096 bytes
font_01_sfnt_off00014184.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 16792 bytes
font_02_sfnt_off0001599b.bin
dc0b34b4c71b6ee3847aa89b15158ca2d7e5d9949c6fe8b310487fd20d0a3908
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10916 bytes