Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbb1863f296b087…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 20:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d8bae29e7e76290e1cb495f4d91c27a SHA-1: 473363dd6646eb83b682a111999dc8590451e14b SHA-256: 0fbb1863f296b087bce250c506e737ca94ae079ae236195ce6bc47ea0accc9fa
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. The presence of multiple compromised CMS upload links further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://shipsupply.ru/userfiles/files/814162091.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0ef0d93dd---rebokutu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607887a004615---wimeri.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlj1pgb27blupsf554n1akjt3l/gasoguni.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c4e8d5c2c---bomawal.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf3d2eabfe6839127955c165c29e7b03/furaluwuzugiperiwu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4de1f1e9---76181372813.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/690d82c2b3dca53bfe56d97182fae7b8/18749355955.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d292f17---nepiviruruxeris.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eedad2250---6060630379.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708abbf3d35---50232663933.pdf
    • http://flygarfield.net/userfiles/file/18365594848.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c1344782ca75815008a764429ff1d466/36342319756.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b7f3d16697a191e65de6fdcf6271a1db/50543465612.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/47b2ac4d68eaa515dc9cb7875f333253/rokupuwunogisuxa.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e0ee3806f---latewunupimututomegekoken.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/49b6f460f51dce11f775310732065afd/zepim.pdf
    • http://menafundinfo.com/userfiles/file/pisikemaginex.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rrcb5moh1vnffu8nag7ntp23o1/90312190798.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b768f7f1243371b44e7994959ad11c05/32835082016.pdf
    • http://ros-grad.ru/fck_editor_files/files/27554332955.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/85181eb5176fc0000ca45d8655bcd20f/84225542537.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=excel+voice+typing
    • 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_off0000e9a4.bin
b1c8c1d100e20814a6348cafac5d6a53559a889dcb6673ae6101dd67182e86ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 17848 bytes
font_01_sfnt_off0001182c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
font_02_sfnt_off00013043.bin
70e8c8cc3f7a94938268b93fd9789ed0d5b1f5ab4e0d23972fd20b4d86263b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 10384 bytes

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