Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b9f60829dab8ff…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 19:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3aacce5bdfe0ca1d8f6834f173e8eef4 SHA-1: 7ef8ea4d49cd17b4dfaa333abc73ced5fa0863f4 SHA-256: 81b9f60829dab8ffb19c328aaf8c53db23148f1ba3fad9d01c4a16165b3dfeb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs a link farm strategy, hosting malicious PDFs on compromised WordPress sites, and uses a 'vehicle rental agreement' lure to entice users. While no scripts were directly extracted, the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary function is to redirect users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4cbd3b95---bapelar.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9r2fqhfhvecdb7oga827l0qdu2/41115777690.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae6806727---lodimukefizem.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a85bb156---25795406839.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbc04c0be---lijitasavoxek.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/15f506f341838280453442d171816f20/28706567016.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/39264403083.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504152603688553.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/10357428232.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d471020deaa---24385641388.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/78910005185.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4hs9sb08ea6ihk62u3agonlg8a/bopexonosodofibinat.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/78433673870.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160965b78b68df---18430819671.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160789f5b4aded---kelebozagiturejapibu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1152dd940c435c2a53f77da666eda3f6/gaxitipu.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/disapaxofat.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb50daed5---404025006.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5fd5157e5aba94a07c8f4fad090b1f1f/nelikulipe.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/28911770519.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wokezitubefez.pdfIn PDF document text
    • http://short-story.ru/upload/file/jepotizegijog.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00cc7a4ee---sefetowetejipuvavobaguse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vehicle+rental+agreement+templatePDF 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_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 10500 bytes
SHA-256: 14b0702fe9f0eaad4e1063ea30c14d74ba29de076bf032825ae4a4defdc29b32
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 17656 bytes
SHA-256: 588c1718651b516442c784268a04a5612448c2843ae091328bd919e498b7d063