Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b33455dad2d76e…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 23:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 38140c7322998d043c1dca96bc6cf559 SHA-1: 90d069e6fb7e4a1c9d812ad4e44725de29bc14da SHA-256: c8b33455dad2d76e780485affda36173cd92ed60c3d6d089c6cae424e9d9200a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/pofovona.pdf In PDF document text
    • https://cleanenergy.mn/uploads/files/repuxaj.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/sobewemezerafafosofetepid.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/84660178059.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/dumizajirarunanawinukox.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a2426438aed8beca87b25acfb96d4e71/38051443032.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/42930922561.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/bapuxufas.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/pifipapebi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fec5fc4e---limuwuxudob.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/sabetulitopimiwe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4ioc56j984p851gc5bdcnvolnu/66305604443.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/u6aoeg13p92ea4pha2536nid46/rovatiwatukapafivisulano.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/paneronu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abf922a8913---78811933885.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087282410a00---30691505013.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/12909577534.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fajakalamodijixidagevutu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c888a46ec92a5b6d45763aa3b3473e9a/gobonijasutuwosefabevike.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9c20480c---mixovazasokimudivowujada.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/de5900c71a8cd85b15de1d3802258e77/fubiwuxoditebun.pdfIn PDF document text
    • https://hirurgija.me//files/retudatirejiso.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/fusigulegejujemin.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dagapidulajosirexedijax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=28+days+later+zombiesPDF 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_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10848 bytes
SHA-256: 56ff3c10d4997f88679943736617d028331f06ada101be6dc3df7be5b774348f
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 16820 bytes
SHA-256: f19879dd791250f2f19f05053523ea0ed8f941d9e652087002cf271598fcc273
font_02_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1