Malicious PDF — malware analysis report

Static analysis result for SHA-256 92329bc950a0a8ad…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 13:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1fb872ed950592eb1f49975d205c16a SHA-1: 337b588cc784418b1372a27c36d218e520b7152b SHA-256: 92329bc950a0a8ad4e5dd1255fd129d6e3fe3444c200d8b262a538c04ed444bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://agcslohian.com/userfiles/file/wulidasizofuxok.pdf In PDF document text
    • http://nhactheducthammy.com/upload/files/gudufonefovafopozasa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd86058ee29---xemen.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/35de08bb45393e128053889645ede47e/niguxujanapasujar.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/retuwe.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2b28899d9f31b4b95e09ce4b9a54d209/14178740649.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/pufaretix.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jagurimigutama.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gosakubufaseres.pdfIn PDF document text
    • http://bio86.fr/fichiers/65381276268.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3d23a953a953b0f6802873ebd80fbced/39808096917.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vorokilinipuzivilewarad.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/88276417357.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161254e88a1648---60795982768.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6443852c93---78153842027.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d19aeb45---rogodazogudafolu.pdfIn PDF document text
    • https://seerupit.dk/assens/file/74956218097.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/82286715554.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/nifudagowijiwesaxiv.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/39831620892.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c973533b4d---8331726119.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3637785e9877018d95754a384abc3bdc/pinefagetusupuvam.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609595f0369a0---vubopomofijoxafanugawu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7a3c1678---vudixinijufasemuguluma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+gospel+of+the+lord+praise+to+youPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3a8e1382e0703a7f813d4a050d00cc5d/53805366975.pdfIn PDF document text
    • 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_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 20152 bytes
SHA-256: aacd77f93ffc734e30c6caa0e839093201e3b40346df14c654249c051103492d
font_01_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 10852 bytes
SHA-256: eff980f9654b8a205ab9143437c67c72b5f8516f7543bd22c40ae762a728c968
font_02_sfnt_off00014702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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