Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddcf3756ae4899e…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 23:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30329fc94ee5569a3cc26e4a7ae569ce SHA-1: 3fa535c8109995bc9c59f5e4e666899350fa6bbf SHA-256: bddcf3756ae4899e127a317cb31a7cba77202e94e1b506220d20d40156f48623
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://krisoc.ru/uplcv?utm_term=height+tv+should+be+mounted
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632bd41566---gotisoxuzojepe.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5ac2f04674b19f933903aaef2cf3e611/57588577201.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/lusemafomamat.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d749e796---14261343731.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9807c8f4---jarusuxufusokabeni.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160881bab701d1---1592377362.pdf
    • https://zebcom.in/userfiles/file/nepikufo.pdf
    • http://www.prieteniitehnicii.ro/documente/file/45623714928.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/05852fea239dd92829e1dbd31dfe6f85/24209606510.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/butuwakakaxixekilusidiver.pdf
    • https://prospr.fr/ckfinder/userfiles/files/pezigolilarudilato.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/34207b3629a258ac30a57fa73d72fe9b/209767755.pdf
    • http://vimbark.sk/editor_uploads/files/96841797724.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cb3d7c95295391620b37d0b4a396bb7d/28829433935.pdf
    • http://agendatourvietnam.com/hinhanh/file/13555955890.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fd055d7337d4714d7f55ddbfac8423d8/selowol.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079325415628---dukodisaweza.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc7b9f7ac---86975153392.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609644c2e4904---77330333721.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/bde296ed03fbaf48e43be3a3753b36aa/34649086177.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139204c0c5---68749214323.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nklia8usv3e9bmhfgo6d1f5r3g/pezusalebuwibigasubaf.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c61b27e6c---nazorukarobijubefatokalas.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f3cb26ad---kojebe.pdf
    • http://world-green-hope.com/uploads/files/mafinuz.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ee3c3f51d4339f62513ddd27c1a419cc/27143539814.pdf
    • 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_off0000f004.bin
fcfecb058643f5e28fd2834319206041625f8b02bd137088a6483d908962e2be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 17004 bytes
font_01_sfnt_off00011c80.bin
d5751344b68ba24127c3424c956a5765c3a37268a344a0fa53cebba8d6047fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10728 bytes
font_02_sfnt_off000134b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes

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