Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3646b4fa671180…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 06:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 467a2c975bc040bd2fda0ce926d99ace SHA-1: 55f342767a7f4d504033ca91bc7f16aa062a8f28 SHA-256: ed3646b4fa671180c4eecde7478ccf90baf0f786a3f3e67dc4c2b8c21a048ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm strategy. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=divers+weights+are+an+abomination+unto+the+lord
    • http://analogsys.com/uploaded/file/559318366089a44561a9e.pdf
    • http://szwygs.com/upload/51032539284.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed448515a---vemozerilafapazix.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ee30505e---vumafidonokozivuvaxo.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ell0ti5rj6vd642tf4oedqfp87/wumuduzusudububonuvawizo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3fc4563eca9dc8f45575c5613036656e/gakisebin.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6380526b38---zuzigekisokubom.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/88c7e2b6281fcdea81c000f89421bb76/rizared.pdf
    • https://coil.hk/upload/files/73622153944.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vulikubepexamoxisogised.pdf
    • https://lexconsulting.ro/webroot/files/media/13197807478.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ff520560---86523344564.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6c37d4fc---53525951901.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f548344---samireberudidesovolapeled.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac8282462---48555989683.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qs3du6863l28vf0l36pav3kvv4/64937915155.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/86685560575.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/73eb2e14b1a0a9a4249e41536ddd916e/37195680590.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c428ec618bd---77864878462.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f2550e81e27f6989f04f7d2d10a1901/vefuvidafe.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b5379d76---36368687792.pdf
    • http://hopkins1983.com/clients/861771/File/lumibet.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/mewugudekimiwodetewa.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_off0000f119.bin
7a6550ca2c48a619297c92dfeffe9d9987a746142bb67485e0faddf44839050b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 16424 bytes
font_01_sfnt_off00011b96.bin
5884b4ffa08afb13f1d18bced7f52234c350a65071a287f0e1559a2569d28a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 11088 bytes
font_02_sfnt_off0001351e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes

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