Malicious PDF — malware analysis report

Static analysis result for SHA-256 6027c1eb6422e133…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 19:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76482d2fbc26a879f764f4111c564363 SHA-1: 3f7d45ae51d489aa60778ebad24d8bc5a328e422 SHA-256: 6027c1eb6422e1338a8e20e4c8724d71ff1f84607cdfdee076d1fb8c6d53d25f
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 compromised or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=chrome+block+website+mobile
    • http://kaithompson.com/userfiles/file/jodejolazeditoj.pdf
    • http://dierenwinkelindex.nl/images/uploads/90541772014.pdf
    • http://hondatayho.top/img-ngocbao/files/61650552775.pdf
    • https://cowichanseniors.ca/userfiles/file/wozesojaresunowevukoku.pdf
    • http://p-jtech.com/userData/board/file/sozazari.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/95c573b9a033e49a04afd81194aeb4c6/42824403263.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/30529844758.pdf
    • http://na-bytecek.cz/UserFiles/File/nigovidebenoto.pdf
    • http://ilink.pl/userfiles/file/judedagonarawebuw.pdf
    • http://chiari-web.com/ckfinder/optimist/files/25421527008.pdf
    • http://stisk.com/file/20000248475.pdf
    • http://viettruss.com/upload/file/werotevadegelisadu.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/44bafcb2c087a27b109431d1f55ddc8c/kodakanemurobefigigi.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/52272774477.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614236702c962---87040422963.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/80632776981.pdf
    • http://astorandblack.net/emailer/userfiles/file/18941020472.pdf
    • http://carsonpokebar.com/uploads/files/rixonenejitigejojosekefu.pdf
    • https://wonwon.taipei/photo/file/37758485098.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/bamepabavekibirezexejuf.pdf
    • http://jca-t.com/fck_image/file/rarekijizunolusawed.pdf
    • https://sunsetlearningcenter.com/userfiles/file/51343518934.pdf
    • https://stormester.no/files/file/zarobetef.pdf
    • https://thehouseproduction.net/file/90942114171.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 16792 bytes
font_01_sfnt_off0000c896.bin
4e8b9abce9bcdd06b0153af937f952559fa930a0ff4d0d5e7b828ee92cabe8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 10580 bytes
font_02_sfnt_off0000e0d4.bin
86d05dc5e30a2bc64dbf88b1dfbd2600c81d19452f83c7560fefcbf034a3b7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 16052 bytes

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