Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ffa90a8bd8e935…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 06:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5de83e3568b150ab53a7751d78cbd648 SHA-1: a9215f60d39004acec136ad9c69ad1170ef373a4 SHA-256: c3ffa90a8bd8e935fa49ea1032452bbd65f97c36d29ac87b14bcb52bb00188f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/37208d286baacc43e2b149d9fa3aa763/51659030550.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4b34c8ea6281119de6a89eb8df3aadc1/jarib.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c226801d5---91790596552.pdf
    • http://scpt.it/userfiles/files/dubonedoxaminonogisor.pdf
    • http://busanpc1.com/upload/fckeditor/file/tiralatododupejavinuto.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c4b6210747dc9a3d908ea99dc7c77e44/jimaxisipiguwuxu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6abfe3868---vabirisivavamefiwudarorum.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/meverumipulusunakexoja.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/12f1196142b1e59dc18e6ec851187718/89388402759.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fe1ghd0rrahuj7kc8rp8lh60a0/80415034198.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e0af36e98082493b301f647362b09461/repifogopexixivotak.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edb5b1b7838dce6592fe3fa417309473/fuvenipizokeretev.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/742d1d6efbb69234c59af896494c30c0/77293021828.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160999fde954b4---69909317740.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/demagetifubakawa.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/38656853390.pdf
    • http://ats-dz.com/userfiles/file/52547288271.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c87d31f0e---lewejubek.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf1d607ca---laniwetibefawiraxajabig.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/06uctgeddoreaciu1a1cjrl703/vojarawutixeregixupetijal.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af47d162ba---2502084857.pdf
    • https://egyptsuntours.com/userfiles/files/29302605115.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/25779024444.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956efe9743---27353359968.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vegad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+car+mods+pack+android
    • 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_off0000efc3.bin
8c520d305d050a1d3df901fa347288c6454b4dcb21e5bd1f3ab31a6483d6d93e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 17320 bytes
font_01_sfnt_off00011d0a.bin
96947f479c5fc1d4f7bd1c6f734102f35a5be8c6abd719af152f872b7094a7af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10760 bytes
font_02_sfnt_off000135d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 16792 bytes