Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9fcfcef1416008…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00607dde73ce1f6295c7e10dd44d1558 SHA-1: 9f0996c8fdc099069fb3cead466906bea72fe96a SHA-256: 3c9fcfcef1416008d376c212c38e37f08730e3ee129e5dc308f0d25b55c6141d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sugarfree-gelato.com/upload/file/45967541929.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d04ce6b366ecd4f10356197884a8841f/vijoroxuvibidumexemukewud.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/3662546509.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/56653884488.pdf
    • http://s2ipower.com/survey/userfiles/files/47225315412.pdf
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/5464939444.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607508f81891e---lodabofopeleximaros.pdf
    • http://londonjip.com/userData/board/file/suxufakukizafesija.pdf
    • http://chalappuram.com/userfiles/file/2026004644.pdf
    • http://tks-forever.com/upload/2021/06/29/file/rozifejujinefaregeda.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/nedisimigikizinipikewovu.pdf
    • http://devitohomesorlando.com/userfiles/files/zakigepavaxuj.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/19329197871.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ad2a03298a48a9da5642083d6f4f9caf/katirasufifekizo.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5699a86b93---90855778412.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/252d1ae6cf67b3356de85d32c5a28d3f/58841441023.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d1f1e317e76f25cb57a98d36303fb6be/71399052822.pdf
    • https://ev-owners.jp/userfiles//files/94899166101.pdf
    • http://grafichesirio.com/userfiles/files/boguvo.pdf
    • http://namkhoabacninh.com/images/files/gefoginekabixuripozus.pdf
    • http://www.como-grup.ro/fisiere/file/49902006462.pdf
    • http://z500.si/files/99094416361.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4a4768a116e246538e58152f90d4220d/gutaw.pdf
    • http://vertex-decor.com/userfiles/file/96371781795.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/gokosuxo.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/49969935109.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/67c10c1f423a00700d795a5a3b300b6b/pigeloz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=illustrator+adobe+pdf+file+format+is+having+difficulties
    • 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_off0000e2ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
font_01_sfnt_off0000fae0.bin
31401a30cfe1d0ddb55e5e6db40cd0d53cf2254685d6e4930b82bab59053a12c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 17568 bytes
font_02_sfnt_off00012871.bin
2e17b36d895066b6b7f48e317997b51dc3c11f1f809d71a726d11a4a744fe8eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 11324 bytes