Malicious PDF — malware analysis report

Static analysis result for SHA-256 10742cec94ecf70d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 02:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b876a1447b9683cba6f3bd9e60153301 SHA-1: 98c4d61dfedfc0558e1a96209cacf135538de9bd SHA-256: 10742cec94ecf70df9f646f182e2331eed955037e7d1d698906e62d6069d54d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=the+wolf+of+wall+street+full+movie+watch+free+online PDF link annotation
    • http://kisito.com/userfiles/file/57787107044.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/kasotewotijujigerimefaj.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109220115331997.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/77669816854.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed71317312---vixodawevur.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8161ce7---sumosotisofuzok.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210923_185542.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/22672186685.pdfIn PDF document text
    • http://tcihk.com/userfiles/27941033336.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/59156320485.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/81172523350.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/zilifudiw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/250c98a8c8f0e47bc5c2a05258ddfae9/kunafog.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/nazuretuguwurak.pdfIn PDF document text
    • http://hanauhrova.cz/files/rarufifidirewegosamaj.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/8998142980.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/60559573385.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tenifaxipitololil.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/bexofanaparogefa.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/98649020873.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qvt25r0atdo998cap812nkkdud/2703896375.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/99664487125.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/72238466430.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613685f721d67---sijawovutoz.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_off0000b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 17688 bytes
SHA-256: da50c80066ff70874a213b2cd464917d3aed97c0725e928319de923b3fdecbde
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 10816 bytes
SHA-256: 237e1fc3c985a9120f0122ccd2f1e0ed85becdc6985910e730e5039f3ec22bee
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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