Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc67c81c8457552…

MALICIOUS

PDF

78.2 KB Created: 2021-07-05 05:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5286d88f97e8044b32f4b2c94167e25 SHA-1: dbf7a7ebf7543ea74f22f639e6a3162982fd5cf2 SHA-256: 9cc67c81c8457552e4bfe1f20005cd7a9f5bde0f23bce23f4a76f4c9333a4c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=red+border+collie+puppies+for+sale
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35b7c4cc41---walananugulix.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gewuvatifejol.pdf
    • https://arerp.kr/data/file///76031076034.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/lafepupozolepijukavesavir.pdf
    • http://rentbucharest.net/images/userfiles/kadasivipajetukozofaxa.pdf
    • http://anatolianlgs.com/userfiles/file/92462445143.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8qqp2ivbos7uk60lsik2o4lm0l/lezufenew.pdf
    • http://elementsgogreen.com/userfiles/file/83338327610.pdf
    • http://hoangduy.vn/vn/files/valexirog.pdf
    • https://alternativecarrepair.com/userfiles/file/badowapizilifikizezo.pdf
    • http://www.sport-konyv.hu/userfiles/file/beterelagexab.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dec10f2e45aa1205fec181d32ffb4daa/talax.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074022827149---gobopomilujevuz.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f36a5204---xemafavifu.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/587m4mug01pm6fk4p9tauntsag/12965984341.pdf
    • http://altelaw.com/uploads/image/file/91069344848.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16097420ee59d0---20540687571.pdf
    • http://dietetyka-24.pl/images/files/botabikusedapo.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xetuvasabedajemin.pdf
    • http://odontoflash.eu/userfiles/files/kaginatufaxefewojovifek.pdf
    • http://salonorganica.ru/upload/files/fijapi.pdf
    • http://alpha-th.com/userfiles/file/24034847352.pdf
    • http://artecgroupservices.com/imagenes/file/36101165899.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd487be83---duvisuwosadikegolip.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b819029ba6a---639274210.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160afb530af209---basefev.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_off0000cea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 16792 bytes
font_01_sfnt_off0000e6c0.bin
62b793b1adad9f4b5e0f22d0b12b45bcb5c872772694317e3585642534c11d6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 10696 bytes
font_02_sfnt_off0000ff21.bin
9510d6e893e4e525e9dada8203ae5e312f8927df4885064ac5ff6ae6a71d7ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16936 bytes