Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75025a2f84b09ba…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 00:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d51e3e0bdb9eb4dbc7cbc7e78a0f5f2 SHA-1: 749ebb9ab704cf42d620a8beafb8b7b33862711f SHA-256: f75025a2f84b09ba38f0fb0f41d6cfc264f61ae19eaa28b74cc6a2a2c22069a6
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 disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=problem+play+store+download+pending PDF link annotation
    • https://mimpiindahsatu.com/contents/files/wosisijopagepepumixexen.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/sorafobuvo.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/94686538734.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf5304b8d2---lokogute.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/16388291483.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bidetoxexal.pdfIn PDF document text
    • http://infracsap.hu/files/file/zerawojasalitutememijapi.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pugomava.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148912b663b7---janutozixuxol.pdfIn PDF document text
    • http://chinalabware.ru/d/files/zuruduzifeta.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/55285639317.pdfIn PDF document text
    • http://apart1day.ru/file/sivajilodub.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/susipizugifararenudatajiw.pdfIn PDF document text
    • http://sun-eko.eu/files/file/6013546845.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/95965944592.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujekajijawat.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca1050cd27---75351130935.pdfIn PDF document text
    • http://isvpro.com/custom/files/20638615340.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/zuzigimubojalalupivopoxi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae4e5866e---lupadof.pdfIn PDF document text
    • http://vina2002.com/uploads/files/letipugezopeseripaxuj.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/sarekiwixami.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/xokodiwotezuve.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/5555534911.pdfIn PDF document text
    • 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16412 bytes
SHA-256: 9ee2eb937df1cbc29a6754302c5efe29a39421f7544fcac52ecf52ace8ef14ec
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 11076 bytes
SHA-256: 2fe1a981702498942dac703e1b6eb136010658aaec5bcce94f0bb26959c28561
font_02_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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