Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8da0ee475ff22d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 13:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b11e744df48c70108a02adea6836172 SHA-1: 3a42f30364634782c21a74670e2ac9b38e5070eb SHA-256: 7a8da0ee475ff22d96d26391a86f6fa330fe3e7227dd616895dedeeb53dadf1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to redirect users to malicious content or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/56jn0t80cugmvkcs1gvb26rfi6/wofiluxomovujazavokufu.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9155aeabe2---14011191742.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271a08d8ca---32077907437.pdf
    • https://cnc-ar.ro/files/file/pedivagadev.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/53105546200.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99742368a---93042172753.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bee2961b0f156c4cde1b8df46f9d8c8c/rixilapo.pdf
    • http://ccswcd.com/userfiles/file/temesikap.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/digifozufulowig.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc1b8d38---lawumudijeniv.pdf
    • http://peusch.lu/userfiles/files/lojefefelosuzopodavu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/394ecbf117d730f79c83dcc7671b6dc0/zejozowujafazize.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607412b0f335f---bafuk.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mhq1iqr84rr5ssvmcq3et79mv1/76866397840.pdf
    • http://chinoboxingclub.com/clients/36032/File/negiwixumukedujunogafid.pdf
    • http://doremimarlikinsaat.com/userfiles/file/74487849972.pdf
    • https://rrr71.ru/upload_picture/pepopulabovar.pdf
    • http://timavoshipsupply.it/userfiles/file/43728140925.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d7720271---43596758673.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/61409012660.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111b4f435e0b---movivimirexoromukosor.pdf
    • http://ahcxdq.com/uploads/file/300147263197.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/38315413035.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/q5ld3is32an2o9tcsltc1ekcbp/12442482220.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/86cba3e7fc86ad30c8c9dc7304f3f376/38403819625.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=algorithms+unlocked+pdf+download
    • 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_off0000db94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16792 bytes
font_01_sfnt_off0000f3a6.bin
9cf767f62b322b31038953593dc25452036300fb50f2299391193df285cb4235
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 18940 bytes
font_02_sfnt_off000124c4.bin
c358325ff9c8dca057db1ee805add1c603c255a0c347557e5dd07b1ee49f0c48
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 11328 bytes