Malicious PDF — malware analysis report

Static analysis result for SHA-256 df85394018cef346…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 19:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f731e84bcadac1845f8fd7b5e13e12d SHA-1: f6cbb9896dc560e069b9aba0e0c024a359bc3fbc SHA-256: df85394018cef3466dc81d4d513bde7ac0ebee2bd59abe9d1e67e066efaa7e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zpb-maciejewski.pl/upload/fck/file/48682177662.pdf In PDF document text
    • http://domgr11.ru/uploads/files/86904509910.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/gobabasusitomizukeg.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rha7o0dgq9ckcqcn8f6snp1v44/52610246581.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/nusovugekexaduzareb.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210525214218.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/piwodemu.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27674696750.pdfIn PDF document text
    • http://julianina.dk/upload/file/babenelujikuvobedi.pdfIn PDF document text
    • https://strechybenesov.cz/content/kesosujomegufez.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/pepewuxin.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/dogijosodewazarowiji.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuxadeduwuvukiginisimunex.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f190cb223---nusimerevomobozibax.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/o3cd477qtr612hqheaafmrqakq/7287562883.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/guvopikofemuwisi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cea1850f6848e5f87ef8941620fe9222/tobava.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/ritilupobokujowav.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/51691253682.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/nedoxesanenov.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ob43jnbc5voav4hu8k3h0pj3dj/sigivufodavovevuxunebilav.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43ce815f0---19575662900.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/41455148696.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/zugedekeberufobevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=extraction+of+iron+ore+pdfPDF 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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 10484 bytes
SHA-256: 96b7d0464ec218f9dd57173652809ce0bf86725fd85673dde0e3da1431283f07
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 17072 bytes
SHA-256: 473e75de57f9158b49d41e5ae8ca3ce10b95faa6b9102b76797d4f6c4c983bbb

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