Malicious PDF — malware analysis report

Static analysis result for SHA-256 031362eb2798678e…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 13:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 621b1a3b12668c49d7c88ef278e4a2e4 SHA-1: 1a0eb64a086bcba6cfe11ff930c3fe77d998da83 SHA-256: 031362eb2798678e967b7e7e70e73ead2977fd97c5f4665596ac70e0d619209a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing or malware. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/drtl5sd9f06apgerjd82kh7vo1/dorubakofuronufexoso.pdf
    • https://businesslife.com/content/file/47415552305.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/iaegqccqrf0nldu55f9rghgrnd/puvalif.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/75426d339f3bd30c48833a0385887876/51017889612.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/geok4bke1o5i1lfbrk17k7b61o/rawuked.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c915e3233fd---8834213620.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4cd6cd9d2a27f3fd514a61c818bcef2d/75520054167.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638126560a---81704098810.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/wogivijubifopelav.pdf
    • https://masini-de-ambalat.ro/images/userfiles/memudofujifobowowotipelew.pdf
    • https://underworldgear.com/upload/users/files/22474782014.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/71619572638.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cb2bf7cc---66533714329.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608620a092fea---3815865834.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffea8f9a6---kafuginakudibudojoxu.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/92c3eb3b1d06f4e8058aa16c6d8e62e3/porelerasaw.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab69a1c8c5---bolobumalizewiwurizun.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b503e32dd011c4b0d062442a8b9726f/47054720163.pdf
    • http://afghansolar.com/userfiles/file/26067195966.pdf
    • http://poltinka.ru/userfiles/file/12012442104.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/eftu14acoqotvp7badtquv5r10/17051454187.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/19253387473.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fd0ea90abc06c1074907e9956adc7b91/66687456241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cost+to+build+hydroelectric+power+plant
    • 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_off0000ef8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
font_01_sfnt_off000107a5.bin
8c924dd9af4b5897a8ac4be3518640df5f9a14ae0f781abbf967a36dc3e036b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 11084 bytes
font_02_sfnt_off00012149.bin
eb150c7f899516ffd13a6ed6518b810f55588a65d0e1d137d310d63a921b45ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 17144 bytes