Malicious PDF — malware analysis report

Static analysis result for SHA-256 736da8eff4bcec90…

MALICIOUS

PDF

164.8 KB Created: 2021-06-26 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 97929b5438c10f3c7b3d1b6bd8664937 SHA-1: 4047fe9ab660edfbc915199f9b0ecf5292d2be8b SHA-256: 736da8eff4bcec901cc8d32debd6bb7dc8f2930774e3254e173df86a8d332607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crewmak.ru/uplcv?utm_term=organizational+behaviour+case+study+with+solution PDF link annotation
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ec8da507d0ef46e5cf7cd930405b0d44/13021282695.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/3845572219.pdfIn PDF document text
    • http://sakem.org/userfiles/files/39730252009.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f920f80bb6---sozexijilorizav.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5a9a750c---77101659301.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/843c0a772552c9ee0d64148da2f369da/volokigenuguripitewajude.pdfIn PDF document text
    • http://mldinsaat.com/image/files/netugafezelefolafisa.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/12cc1a92da2bd8e6ee4c36961561a6d4/puwilebupe.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a00b5ae9266016f695e3b724112443f0/79509137905.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80f83cee3---13276894944.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b805568f7---5595858109.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a589d1c193b---tuvoxep.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xokib.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fab38dcc---robibukiderijefolutodeli.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/83cbgb8j4saa18lpcqu6id7eg6/xuneko.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sojojekadifirixotevurema.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e1be834b---kunadiji.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/42419873059.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/84042286092.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/retirabigenidezumera.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23479485136.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_off0002242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2242B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C42 11240 bytes
SHA-256: 1f54b5e83a3bad4c1b90cf657a39fd8d0173bd0fe01cfb18480f54a89da739ae
font_02_sfnt_off0002567b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2567B 17856 bytes
SHA-256: 8e19e5884b09f62287de160613f4928a5fee2af4bd9b4ed15d3fd93f4e66bc04

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