Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbe844bbbed3d81…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f73e10b3d4e6acfd41133494e725648 SHA-1: 653f526e7beb9294d68dcac0608078b49fbcf961 SHA-256: 7cbe844bbbed3d81cfff1a9eda7f4e6a35c6f1bb42b7b4da6836204371efe8e9
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many of which point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8453b32bdb936fe351778789629a5ece/83936844022.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bmtme7lcggof1bla8i27bkjrqj/pamemurotafemijolu.pdf
    • https://srinivasagroup.com/ci/userfiles/files/84072015880.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b6df6f32c49633ec31884f6708861d5e/75358738655.pdf
    • https://adasms.fr/userfiles/file/lisedukojatapabax.pdf
    • http://qachs88.com/clients/58271/File/fitutuv.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/pj06b9tkkmu48mkaqv4p9n4gt1/1002007469.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe61d8b28---23550840630.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/aebd5bf8734a532e0565b07250fb762a/63487135375.pdf
    • http://kururlaub-ungarn.de/bilder/files/fisupisujawepi.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69bfed2d6---padojonop.pdf
    • http://jhdljz.com/userfiles/file/1624938163.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/cb3382f3e8dc8a432260056cea329a69/60595673006.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608131609a83f---kibijejada.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sobgnli2t06rgt0d0k1933d71b/tozobewagomuja.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e6badf67---42327229681.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085918c7e762---mirafeb.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9bf5e8dc2a78589bfc4e84f1b0ee2cf/nakexetelamiwesidesuxe.pdf
    • http://mamam.by/upload/File/file/wejulatigovikizow.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd888f740---38237905006.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wowikugov.pdf
    • http://3dtechgroup.com/uploads/image/files/87782825207.pdf
    • http://kapli74.ru/upload_picture/wupezibuxud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=plus+one+computer+application+malayalam+notes
    • 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_off0000e1ad.bin
cf247d694d9a186128f4dbbaffc53fe513bfa90c9b2106c7400f52aea212ce13
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 16792 bytes
font_01_sfnt_off00010d59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16792 bytes
font_02_sfnt_off00012570.bin
30bbe9842f72abfc2be7367caaa266b02b7c1803167a238e91e5d94e49b04cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 10748 bytes