Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bff7ff8de9bd4b…

MALICIOUS

PDF

107.8 KB Created: 2021-06-25 19:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5180eb588e0e55805ee272981038173c SHA-1: 30579429f28e9a29fa3ee7ff7b34fa602a549a56 SHA-256: 46bff7ff8de9bd4b4ea01723bfb2a247d0b53be20dc34f2c7c03abe0f6d23d15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious with high confidence. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host links. The primary attack pattern observed is the creation of a link farm, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=c%23+input+and+output
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tusejasuweg.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/67m36cf32pcn9eisurmge4stm1/vawepavijav.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5e51895418e1934677b9e06aa26301d5/57746806334.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609281f68129f---80313646715.pdf
    • http://alpha-cp.com/userfiles/file/lemetinavijupino.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c80657c0---bamawibozarovesop.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0b6834c6---wejumojejavexovutag.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23403415313.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087425ecc0b1---10581835654.pdf
    • http://mai-colle.jp/userfiles/file/lojitimiwetalaxamibuf.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a787e5952f---27938450732.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68af0d623---71652491176.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1e7a5556f8692f588c3815f5885dd598/27667139124.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/28c4782b4bbcbee8bcf09db136d94aeb/zojajuji.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ef90b8aff0e783e82b789c91d58768e1/37467489494.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5b4570893e5ae75d0f1d6dbaa8cc0b73/jobuluneg.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820afd716db---mibuxivufurakakerujisupuw.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4ff0e53d88090dbb17af7e73ce037e3e/52935155846.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0140eec77---venonivu.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b4df0af0---54015163235.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e767e49af2---tobipezijoj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcc.bin
fa133159517f2a6d0f2f6931ee77b5db1d69995af6ad61ccf6e639b7a049a06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16984 bytes
font_01_sfnt_off000124c3.bin
399a8043927aa47f9450b6a4f9b5d48ec293d5f0e7980eb3c41a0b0a1715cba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 31476 bytes
font_02_sfnt_off00016f96.bin
3c15da991b16fcc268d8d33266f0982d2616c8d8d09e4e64322fdaef7a2d7494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F96 928 bytes
font_03_sfnt_off00017689.bin
fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17689 9104 bytes
font_04_sfnt_off0001895a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1895A 16792 bytes

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