Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fd3fc61cab4095…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 19:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca8bc12267199d8f3031facbbe62ab44 SHA-1: 456f8416b29007e263c27be07e1b4a105a2d9e9c SHA-256: 77fd3fc61cab409536de0005e4fd3353954f57b994d2e9732b3b165a5a84be1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness, identifying the file as a phishing trojan. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lesartsdansmonjardin.com/userfiles/file/20210607003742.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80169d5014---sofisosegisivomel.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d49e48fd9---66966046110.pdf
    • http://provia-events.de/pics/fotos/1/file/vutadubodomote.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c391b14c18---mojuf.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f90d662c---40671951789.pdf
    • http://ahlhy.com/uploads/file/271458257077.pdf
    • http://4seasonstours.in/userfiles/file/tuzubuxowut.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725ddc3ed28---wugipivimunewifutemimuwun.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1e3a610f---64144660912.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826798cf8d5---54246125782.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ab603bcff8a7e119309814debda07693/fewijorotom.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6eabdff3---tutofafotesirakuliribinig.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc6318d89---tiwutajozosebajufevofamu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/111e12f03b18f82cea1876c0a8835235/wisalumej.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4mujkfdgehlht512u8p2geskgn/bupafefitise.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d72944fb---78764672035.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/16753153945.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/89a5b37cb09e81baee31ed0080952d26/68903141659.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/05f52e4a1654748ca40288cacda78d95/wakukesewofifowejowise.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b33e4965---21202600292.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/59693d9904f27296e3161203cfce810d/kaxatal.pdf
    • http://lyshiying.com/d/files/93290236028.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3fe5798448e19c909e82d73ddcd0b497/wetevujuxevafom.pdf
    • https://arhometutor.com/userfiles/file/tesipezuduwas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cbse+class+7+science+chapter+16+solutions
    • 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_off0000ee32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
font_01_sfnt_off00010649.bin
e530ec4e4b7549ecf29fc81a622dcdb709898cc831e7c47b259edf8893bd1595
pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 11012 bytes
font_02_sfnt_off00011fb8.bin
8ec9f5d9dd13f76e80b006af2d6cae43f58db9ba987ba3a6151ddb2821f922b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16404 bytes