Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f649b2ec7477e1…

MALICIOUS

PDF

90.7 KB Created: 2021-07-10 13:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea24488300ab639567341f030c173c8d SHA-1: a84c55eec9c12fba6e9e8b78e47b5bbf9b071d8e SHA-256: 40f649b2ec7477e112d9b596861b1a189eed22d7995611855d88a39771eb8f0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=difference+between+kelvin+and+celsius+scale
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_963457F121B60F4B.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53ee3281f---wodosinelubatexu.pdf
    • http://kleinschaden.expert/userfiles/file/supitezubusezuvepafa.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521f0d34e2---70915647763.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/997c42dcb44219b214ef1550690ed125/39571439166.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/64bf44c5392a9520507fd04b9e5c7e6a/tanibarolej.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a20a3c8f7---85179675958.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7656919dc---kujufaxobudakedu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dabb65ed6---wegekexekizaxagupinis.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c407945a.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4cba0aaa---rawovuxetebajemep.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8f34a85f02bc7a2b39d8a30b7bf24b17/23480486846.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160911a405a996---kerewepikamexajanodara.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ae8db5e5---lowexatixekarogonomewuzu.pdf
    • http://teenaramainc.org/clients/875997/File/96314281870.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f8dbd298---nigokegitobusinuvulagiliv.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/ruzivuvujojusi.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863007a6006---nuwuroxipidilux.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c27e16a958bb76197f530eeabc60157b/77319162170.pdf
    • http://aimic.com/userfiles/file/pasuvujisetejozilo.pdf
    • http://samurairamenbar.com/uploads/files/lomavopekexukuxon.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d60ad9242f00a914ff973b9559a76989/vivukugezowolale.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_off0000fb97.bin
845acc8961c0ef6e130cea092cf6b0a65bbf9669e44bc5c01f51b35bbd4d7aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 18456 bytes
font_01_sfnt_off00012bf6.bin
f7cb817b545332d11d487d4ec4a48cd69dad51b6c102e44a10fd4b3915f141ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 10832 bytes
font_02_sfnt_off00014530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 16792 bytes

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