Malicious PDF — malware analysis report

Static analysis result for SHA-256 5261422491df3d70…

MALICIOUS

PDF

92.6 KB Created: 2021-07-03 16:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 436b4b71f4b44ac8beb8e9af56225833 SHA-1: 589d6a5e7f3cc3920dda380761baef0a677224e0 SHA-256: 5261422491df3d70094599d6494647b9893a604f8b89724c2782fc71f85b10ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to manipulate search engine results or redirect users to malicious pages. The presence of external URIs and link farm characteristics points towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--l3cbpp3gh4a5g5c.com/userfiles/files/70379139264.pdf In PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/49743984381.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfc9b2848---36084684163.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80979263386.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210530042448.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/36136390406.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/96421094598.pdfIn PDF document text
    • http://sun-eko.eu/files/file/7181213203.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/34md2mmjmf97jg25l7a8196otm/91626585801.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/givixugavaromerudebojuma.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-01/images/files/75979232853.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaed57ea4---mitodarijijiriguro.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/womisiki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f858bc5f11---83693441250.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160885283f1523---1728167395.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fa2dd14b---36908912595.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609659dae71b9---toseva.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/relevo.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/1106845768.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8d851ab4---87268682929.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zeguxosetil.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a76a68c9b---luxuraparerijuladoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+a+disruptive+technologyPDF 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_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11432 bytes
SHA-256: 395fc978895d15541d3417a83c5319d37ad538dfff03a741c0678ec18643076b
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 17576 bytes
SHA-256: 4d3f0c5e39066c6be414ee23183045f39ad954f2e5cc58780e3d0cd1c300184f
font_02_sfnt_off00014d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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