Malicious PDF — malware analysis report

Static analysis result for SHA-256 540f9e44cefd8eef…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 895a3eb26891dde6c1b1fa037104d7e0 SHA-1: 26aaeb646db2c6cbf99f633412810f84eae0e943 SHA-256: 540f9e44cefd8eef1db0fd8a90be9801b5b5e0b44408835213cb2970384f8daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • 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.
  • 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://mamo-tato.ro/userfiles/file/97632283787.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/179281e361feb9c227243ebcad459c13/78638719771.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5c558809b5a78d1aab6a8fc14418346c/valugukugoboginezexo.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kj29gclfe45rg4ib6jtgi1mj2o/31204273681.pdf
    • https://vestol.bg/files/file/20171609213.pdf
    • http://faxik.online/ckfinder/userfiles/files/23109296832.pdf
    • http://www.themixchange.com/userfiles/files/64274056312.pdf
    • http://bluefield1966.com/clients/26642/File/xumoteludozad.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837b7b94fb---37287058423.pdf
    • http://aldo-ins.com/userfiles/file/52200167731.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/eaeac3b0d62948fffe7fb4a2945226de/13034793115.pdf
    • http://kochamsushi.pl/UserFiles/file/tupatogomal.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/a4o64rvpn1crsapkbnj9atd4qg/dasulaz.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e63fd8b0c7535c363466208270d9773/69378609737.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9842c798---webeximoxof.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3bc76039---16222648951.pdf
    • http://viajesalaos.com/webroot/img/files/puwefef.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kh94ja862drp5hm6ede1bh752/berosudefomavinelitufa.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/11c842588fc91ce9256ab1cbdb559d54/25077515891.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609673edbd50f---poxivo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/19ad7ececbefa529773446839a7dbad7/16928197309.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/jizekosudesaxanazedeze.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e3bd6539a3deb6584c3017ddce03ed56/84979247180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prediction+meaning+in+marathi
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8b.bin
2dd027df5bf87051a050ae04baaa5978a5d52bb0dc73c3d3b0103b0dacb127f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 10604 bytes
font_01_sfnt_off0000e24d.bin
e259eebfa6743cd4aae6b9052dc1df0be327799024dbd7c6a17b43103c87f33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 2276 bytes
font_02_sfnt_off0000ec73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
font_03_sfnt_off00010485.bin
5741ec6d86036952db4725141bfe550d16ed1a3b6f8a0be99cdca5fe679bef0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 19716 bytes
font_04_sfnt_off00013843.bin
97ed5c3e40c6cebff20de08d3097b8572ac956d8ee3e2e5720d049ca78f2f5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 16404 bytes

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