Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9118a8db259ef61…

MALICIOUS

PDF

104.7 KB Created: 2021-06-25 13:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e3d403234c30d50fdbc704947b8f75d SHA-1: 7b5d25831370b8a632f750086705a2febd7e88e0 SHA-256: c9118a8db259ef6117c1776d6252b1663edb804ee3189acf006d91dcabbe787c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs are designed to lure users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cortabellanews.com/userimages/jutadijepujeluzofoveg.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22378381876.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0e485f6b5f6314238f9cc4183ae2002/koledarenagivi.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c4411c694ea88e0370c4c94551be75af/tagegugoto.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6907ed56---fuladezojuduxoxe.pdf
    • https://nnkcreations.com/userfiles/file/20278418636.pdf
    • https://erdenetpost.mn/userfiles/files/65439414933.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20b1e1baf---17597227322.pdf
    • http://ipceurope.eu/assets/file/kavipivumirumobarixeme.pdf
    • http://sanders-scottfamily.com/clients/26926/File/mekitodogazamevi.pdf
    • https://semineebrasov.ro/printuri-fi/files/lirarebokuvufudo.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/90ba9712a57a381976d18adc438f0b5c/78035705421.pdf
    • http://heyumpnd.com/userfiles/file///vegugizolegiloxem.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8484f375---vodaxuperezaxi.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f0d028c6ac0b463188e2d8c56faa841c/duxuremisewojotuje.pdf
    • https://invest.pl/userfiles/file/tabagawuxokeketegerav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=piggyback+in+malay
    • 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_off00013d02.bin
411182ef93fd32586e4393c44f01f23dafa17ee5764cc2912394e9def9a2f243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 16316 bytes
font_01_sfnt_off00016731.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16731 16792 bytes
font_02_sfnt_off00017f48.bin
4344a12ed849d54913edc1d5b858474bcb37aa29245319b28cd0dfdd3109c892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F48 10300 bytes

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