Malicious PDF — malware analysis report

Static analysis result for SHA-256 544be2e5ec7df59f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 23:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c1ddad66bff2ca60d90094632bea2aa3 SHA-1: af0d155c4ed02f7addae3ee92bc85ef6d8d07430 SHA-256: 544be2e5ec7df59f41b716f8cabca3be21104e5a956230e3bb2787af20945f54
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://crysiq.ru/uplcv?utm_term=causes+of+hypercalcemia+in+elderly PDF link annotation
    • http://nsdadventist.org/FCKData/file/85481015217.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/75600313333.pdfIn PDF document text
    • http://stasta.com/userfiles/file/60310102060.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6e661c0f---93275576049.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lqq9g43g5rpkpelsh5uf03hgne/paloripojapavugoto.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/6dc46376ff6e4822496b7762c55bb0a4/zesagipobe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8a21dd6b---24942612505.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529034246.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/godajakawisiti.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6d199341cb3513587e2ed672c780ae34/timidavixonivepomiwikixa.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/94629695306.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/fegekores.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/95374690b952caf065f7c85b9660ee36/63579538575.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9feb772980---xotorunakufawo.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/72181489312.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44995931406.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210612_B6E0473BADF0C0C7.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vasudidebediwilekilagew.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59d467098---zerejune.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wosezugavaxapoxuxebetebof.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 11032 bytes
SHA-256: 706a38eea088f858af06a73061963283683208687ecf7195c1ad3d72ef5e1c47
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 17180 bytes
SHA-256: cf51d1b10c893c8da1369fbc595ce749beedbdd911852baf278f83767408506f
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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