Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca91cdfdbe52959…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 09:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52af77b742d3a03372ae7b8247b4b2b4 SHA-1: a0aad9e235351d7bb432d1e6948620867adfaec3 SHA-256: 0ca91cdfdbe529595b9bf0cbc37b1f6879f50260b2fd9b3d3635944df2994739
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or distribute further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pinyardim.com/calisma2/files/uploads/xuxaxomani.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/32415477838.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/97945120716.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ac1530e7d19e58ce9dad10f670958c6d/47745067333.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b943171527f---nekinedasafobodigufowa.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516164234.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a629e5c0964d0ef6ddf048ed93753a1f/jomalujuwalumidolezoli.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/murol.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b579eac4293---rudutoti.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b3393c04---pefon.pdf
    • http://logistra.fr/ressource/site-image/files/fuzokow.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dd51f401cab604700aabc449e353f0b4/xosixajokadowanow.pdf
    • https://giasusinhvien.net/upload/files/bowumejogurofaso.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ef23ea325---daramereroxevud.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae755135e06---jurupop.pdf
    • http://farashimirooz.com/files/86123417627.pdf
    • http://stlnsk.ru/uploads/file/gigepefigomeguju.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160af89b60cdc2---zosanirujajagap.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eb8ba98b---tigovisorupalewetojokevo.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xowulafof.pdf
    • https://cakesandcupcakes.net/userfiles/files/piwepujusub.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160765474312ab---tuwojumizinujawemegut.pdf
    • http://ubestsports.com/imager/files/20210714042945.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sonnet+27+meaning
    • 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_off0000f66c.bin
8e0c80e0da1f76e1ac37066d84e51e53b51c9cdb2e86e5c26739eed4d6236a69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 17516 bytes
font_01_sfnt_off00012487.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 16792 bytes
font_02_sfnt_off00013c9e.bin
f708ebda2425bb4fda1f42f103a7f6671558a80f99c8511390842eb00bf3303a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 10380 bytes