Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc8389d9f49bc9…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 12:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af580cb19fea8dce84a8ddfa452ad3e2 SHA-1: aa7a897db04d048373cb294e7e5dc7102c3109e6 SHA-256: e9dc8389d9f49bc90e358024d85ba13405991026d1bf1f2dac68a3f45320e373
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jdrum-music.com/uploads/ckfiles/files/95880415021.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/34661978523.pdfIn PDF document text
    • https://subarini.ro/mm/file/65368033284.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/basabobugubotuminubib.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160caf5fc8da1d---mafojawinas.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/440891475c4b93fb66d148015258ca52/18146486380.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d328fdc0b54920b6659e6b55663bd4df/35243243615.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/buperazejumixamiwazusido.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e9acba7b---pebazinekozaba.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3f5f26784fa627f15342cc6e7133e9c8/22850354873.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/7931611699.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/86330561dfaac2b2c4678591002dffab/83148347639.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/19838405058.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/3413652080.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d868625fe4451635d0225bfa6b847bb3/zusenobasuzizivibov.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff945e5b5---24953401206.pdfIn PDF document text
    • http://mousike.it/img_ins/files/nadosodurodabuvogalobipik.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166ff08d61---zakodubejurafutaxipadow.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7fc99f9---dikorobakumedozadu.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/pitujosunujobuxokov.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fda62ee3---67825154796.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/51690840061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+converslyPDF link annotation
    • 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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 18820 bytes
SHA-256: 8c0c0a4c3bf9eef997e13096aefac36bc9eb99805892c080265cf2d3277ae7f6
font_01_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 10588 bytes
SHA-256: e8180c7605be19e6b858361df5d03f26f3dfa5ef9fe7f0c43cc0ae7916a407b5
font_02_sfnt_off00013ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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