Malicious PDF — malware analysis report

Static analysis result for SHA-256 46083c3187d5b182…

MALICIOUS

PDF

82.9 KB Created: 2021-07-21 04:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56760cda31b687a3413fe8e646b1af2e SHA-1: 5ddc93c0eeb7c194de73474effe6cf2ef6d4135a SHA-256: 46083c3187d5b18284a9bc47ecf9e45b1bc7866d216545033311d9aeef16605b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or to manipulate search engine rankings. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4de6265c---61322323299.pdf
    • http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/3726085010.pdf
    • http://anandamsanyal.com/userfiles/file/40241250250.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d469ae39651cd7d586d1f5f76fbd1e87/80982221554.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d454a752580---malubelanowugunuta.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/82ae140b3e5d2393901009225933dbea/51718037679.pdf
    • http://daehwa.info/uploaded/file/4950260563.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r0t7kc55mr72js8gnl7qbntlm8/gebalegapikegujivuw.pdf
    • http://0851gay.org/userfiles/202106file/2021061314024670554.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a5496f05---denuwiliza.pdf
    • https://zold-kommando.hu/files/78544195953.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ab777c4dda25223f6d909622fc2fad2b/2070008995.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a206bf24e24---dakigovewaxeluxadun.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f33992ad3---sawujor.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5c663189a5fb4381581538083e1458c2/suwujomowipuzumaxigozu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf28d3a7fd664dfb74530f3c0e56bcd6/pekadimafitubulit.pdf
    • https://alice-immo.com/userfiles/file/jivusesosokava.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608514dbf2642---98851438752.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0cd84734---72120749056.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f921fa6a---rejofojakuzugugavudono.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8fd41104c4a7377b2d0bf1c717cb69b6/puwirenarabililopomox.pdf
    • http://klefmarken.se/upload/file/xinepidifimunawidoto.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v97ndgbpimq5n65gl3sjgcc6o3/someja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=40000+forint+in+euro
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9c.bin
41d083c2dd7c157f8490d6ff07f22593b030d9fda4a415ffe87e1b73b2532bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10036 bytes
font_01_sfnt_off0000f0f8.bin
18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 1696 bytes
font_02_sfnt_off0000f90b.bin
4115b3909a5bcf0f888078094ee65ed4b4c5b7a6a14cb2de29289655de163ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 17140 bytes
font_03_sfnt_off00012626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes

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