Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adef0749fd0798b…

MALICIOUS

PDF

93.2 KB Created: 2021-07-18 16:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b2f1f84d576fae4fdf0befb15d30754 SHA-1: 938df3e3335ac519cffb73b0dec9b7589609b79b SHA-256: 5adef0749fd0798b40e5b38e135ad8980d4128437092d4691859a1dcac4e47ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically related to phishing. The presence of a link farm on potentially compromised infrastructure suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2895fc0d78---filedomedoromakaxojiwe.pdf
    • http://aite-materials.com/upfiles/file/63056016658.pdf
    • http://veronikavilla.hu/userfiles/file/9955524946.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a7115807---12714429311.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9ab622a568574c8b5e4898cab178c8db/tilukimebutibi.pdf
    • http://shipsupply.ru/userfiles/files/72332025689.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae0eba9d6---xaruxadegufoxitali.pdf
    • http://nutronicltd.com/userfiles/file/63750537909.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/93208b0a79820fd0813b6f5aabafa40f/36359443398.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb957acca4---35648176312.pdf
    • http://dongduong.net/Images_upload/files/joxewubumunorodafaruwe.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879e1823d15---luxizeritexiwiwiw.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb6ac3c05---pegemefogetobi.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d052bf5---42687344420.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6853a7fc98e4862c8ee41cab6fe664b/23923663572.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae590a95f1b---norovufesurineg.pdf
    • http://year-c.com/upload_fck/file/2021-6-3/20210603112507983486.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/322d92e48d47cb335505b106455085da/wanidejebi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba9edb3f9---wekog.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4d4a1b773bd29be98818d8e0be8d1a6/67172069125.pdf
    • http://conelser.hu/fck_uploads/file/nufugede.pdf
    • http://plkorea77.com/ckupload/files/88960239026.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5782991087---58615003212.pdf
    • http://thedewakohchang.com/image/upload/File/oloxibimikor.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6b299fcf---58379007126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+negotiated+marriage+by+noelle+adams+read+online
    • 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_off00010650.bin
acdbc20cd5b92c4f99b90b6c9b7766a5f7a5a1e59a536c28c673c76614724350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 18268 bytes
font_01_sfnt_off00013623.bin
2055ab26d9d0966459dfc6fac49173edba929974b07867663eeba538e4fdd78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 10824 bytes
font_02_sfnt_off00014eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 16792 bytes

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