Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f64bfee47e32c23…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 02:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0b4c0f80f2a8950bfd7cf053cb673c3 SHA-1: f2a263421e98d7d63fe20105312793d0cb0b63b4 SHA-256: 2f64bfee47e32c230ec5b16e6aada241ab941632e70ea14cb48b1c99fb2c7423
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or link farm attack. The PRC/3D content and ML classifier further support its malicious nature. The embedded JavaScript likely serves to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://directorvincentchow.com/fck_filemanager_upload/file/27266493311.pdf In PDF document text
    • http://asbazainville.org/userfiles/file/13619131122.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/zurovifolud.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/68668102754.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/duser.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5sb4pluolncqpqjb7gsfm1dad5/lenikubilibubaguturet.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ihen4ej8f77vnj71g5am9rnqrn/8120705775.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607120fa5d377---bufugalebobidegukatiba.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8a13304e078e06a5a48762339e0f5ce/70936334990.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/93712904c0eb09e7b6478fabb75fa120/pavufurafefejumuwivesuv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c986e588---56871308015.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c7de8bc5a36cb110de21e95ba67cd7fe/73194423824.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160acd52ca4a00---13334029190.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210827142938.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/77211210970.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/85297711863.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b4a1c142---87065796967.pdfIn PDF document text
    • http://promador.pl/userfiles/file/fuvap.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/zutepivebonazojirodasonog.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/94468239197.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/43063653907.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6fdc477d9d205faae960e991713ed76b/mawenisezikopitapigewipup.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/sedul.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/suwotoxeziwe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc635d464---92032208748.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe97fbb765---jufuki.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202b8904d6---28119462741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=define+audio+visual+aids+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 10460 bytes
SHA-256: 37abad8e1caa3456ab23db67d9c19c3d86109d10b05164f645ec03c84826cc76
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 16656 bytes
SHA-256: 9ab46e3850250a94a8195551c37f1069e80a96121e6d55f6a2d3ec54bdbed9e0
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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