Malicious PDF — malware analysis report

Static analysis result for SHA-256 af231c46f44f86c3…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 07:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 475a547ac34989661dc2e09e77401d05 SHA-1: 431637ed51fe51daa516c97fdc8e6c4aa4def102 SHA-256: af231c46f44f86c33751fb1c7d082c986611fe7e0657963e3296492a83ba435d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609feebc6fcc1---jekikoxufu.pdf In PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ffkb02vd0hvgdhmgo01qtteiq7/82571649244.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/39463011686.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6522555b2d9ba3d24e83690c8b28497d/jegosozuxigabujorefawomo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7854e365---rulilujulewilijit.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jesuj.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d9f3f07e---nurisafokifogino.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lajub.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ufkg0q0a84mfpnfveq07fnkpf0/molatazabitine.pdfIn PDF document text
    • https://mavibusiness.it/file/bawexitazuwejajitinezol.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/80769343271.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210514023653.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02535eccc8---goxasif.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe89a3c11e---masexijeferipiroxowex.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd40b74d49f---9971202470.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3363ad112---kokedipefonaf.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57a05532b---vetepibivewexoduwepagu.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/totunajukumudidafa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f535211e5988e80343970b3cd74dceb8/dorisopem.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/raderamirotukumar.pdfIn PDF document text
    • https://avenue102.com/uploads/file/84777563060.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2sobmhmdsme6pgo4r3jnu3v45r/fofotanawejafarulakajobeb.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/46334852734.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/78114291504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pro+thermostat+troubleshootingPDF 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_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 17892 bytes
SHA-256: 5d9f59fa607c7c4540a3437e4a0fd1d1d6843ae2437a2bb746481dca0491d034
font_01_sfnt_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16244 10796 bytes
SHA-256: ff038e3cce5274a63ad5826eb6f7e2d382300cb6cd623e510dac0d3f6593de70

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