Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d62a0726324fd8…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 05:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9348be62de688dffde04e5f644c49588 SHA-1: 28a5915c40fa6a0d1f922b7101cacece61472de1 SHA-256: 66d62a0726324fd83ca7526b01e3e416b8f9d651d68d028d416607975c0b1271
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=download+ets2+mod+apk%2Bobb PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ofnd71slp0bv8drroope4tii9l/rulewozolugovabejajon.pdfIn PDF document text
    • http://paliukenas.lt/i/File/95951019655.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidapilifikoxusakezakon.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a644fc25fc0---70861368098.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xodef.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/63720592651.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210630173328169554.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fb1783e6fb6bb35bc29d57c2c379acb1/24266497433.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/62138854217.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wekopamuses.pdfIn PDF document text
    • http://africareview.in/userfiles/file/magizunaliwuweketazakurog.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/7422934615.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kedemuj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6e8569e5---tepoxegofinuvos.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/20615548371.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/vozisiwularakukiz.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xizet.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/c187iguj9na1a54a47gq7enu2m/67068556949.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/82623341481.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/23139458934.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/343f2eba6f1b377706e123cedc29ecdf.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075da60ca752---12822821501.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f062b9da52---85298605875.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a860862ae07---kiruwobuvumibesimuxos.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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 10800 bytes
SHA-256: 435aba3cd772d715c47993fe1568785737f92900884f4e6ae22d8bf2d134acc6
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17168 bytes
SHA-256: 10f7c042c971a5d735fed594f747907a405290dd695fd000ca69a2bf6a65a258
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1