Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad94728aab766e4…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 05:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc89aa09ef2af67e0115d254ab72f856 SHA-1: cd964ca2cacb1333e5e6f8ee860cf79dfe86232f SHA-256: dad94728aab766e4ad7c06c0d9ce827a00e1961ad38f4b7f6d16af76d40e1dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://tumwebthailand.com/ckfinder/userfiles/files/99742810655.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ae221e10eef8b8a4aa398c10ddf975e/17429868585.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/nirusivexiwawunawibati.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/78296282164.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887073edd7e---moriso.pdfIn PDF document text
    • https://soltendance.com/stockages/files/fosimunegipuwawejupupesem.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607af698518a5---835100858.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/94rv8f7oeqaveqv7l1tuj724q0/88539305525.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad699fbba33---nipusemido.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/xikizopadovisikizij.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3a013c9db93b8197add9003f453ac924/69849220943.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muxikadipuro.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13bd58dee1---71997328787.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d772abae9dd45508f7c54c9db4090438/29221878390.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758ceae9db8---xiribatewatagonapom.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76819c5168---78813932267.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lofibebevodikijasuvi.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/moxes.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b9cc481d.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/51966298394.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cbe1d354ffa67bc1b9e0da01082fb822/wugekalagibu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/33027739658.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s7ujumhafmmoegutrhc2n5caov/xepitoporunuxomerurunidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=call+of+duty+black+ops+3+moon+easter+eggPDF link annotation
    • https://mediaget.com/userfiles/files/97365239500.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 16176 bytes
SHA-256: cd0a0230c8aecff08bc36b4b8a464bfc9b2c32be2873db1a0eeb1d938a35c189
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 11520 bytes
SHA-256: 51df37987633b76c7743c0241400660335030e973680b497486593482887f401