Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6b1099c3d7159a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 22:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3181828c1db58b428f522f69ca095b75 SHA-1: 6fff01605454c8c4f721dfb6420de31de84cdbd5 SHA-256: da6b1099c3d7159a4c49d7f3f5cc52cca655d76f26a8eb47087538d3f714f71a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080821852655---limulukabagoxejarum.pdf In PDF document text
    • http://rotang.net/userfiles/file/givugat.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6b3ugfh3tkvej1q5hic2lr0bg6/69472394073.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609449ad4701f---musofefenumagu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6a2c7a5acfd85631ed04e729d8bb9ad3/41018119554.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/3471321735.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a60621a8322---86702224500.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e8c668a4be72e556586c3fe956e9940a/fupuwow.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7d10876e94e4f018805ce775a6c772e/wobupetenabakavazatujaxem.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6af1350313fe710f34b72657b88bd2e4/21698824157.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/75391708573.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d90dd856f2a7670299817d9eec94a60f/41439709130.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ae9bab789c8c46a3b3f2a92cac59f773/basozokidobawiborunet.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607127b37701f---43236523840.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/gozeviderosil.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/kudinige.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/xatexadevagafaz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/14matib7djl30mi6i014hlspc3/60400447317.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eee8e4cd2cb038a73935fa62569c8070/3352540016.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6535c1c1---negomikofezugimelovibox.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wonukaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bully+scholarship+geography+4PDF 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_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 10796 bytes
SHA-256: cb37fbc7d48701debae56ee87ddb916546ee8f2a324625c46f1d329d9fbd984f
font_01_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 17104 bytes
SHA-256: 3c247ef24aa5d26c1b615d134060db102ef1d5cde5df0550c0c46cc0bfc154d6
font_02_sfnt_off0001492c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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