Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a19028e5b31552…

MALICIOUS

PDF

103.5 KB Created: 2021-06-28 04:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8512fb935f260eebf66c6158cb23826a SHA-1: 1f31af9c2e6872020fcf2813c000b57ab52b8ae9 SHA-256: 61a19028e5b31552d6ebe2897d2d06ea0ca5e5c8b01dd277e57038403bae1c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are highly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://coretry.ru/uplcv?utm_term=the+way+you+work+it+you+deserve+it PDF link annotation
    • http://s-privod.ru/userfiles/file/nasijovokotavosifaxow.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vapamazidix.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f34c49571---98716526852.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94968c66b---9055235340.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9cbb41fb---66752132604.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3803b8ca---rubajatimebo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed7a2e34b06714ac2731fac9b555efba/13584290990.pdfIn PDF document text
    • http://bdn10.cz/files/file/44826354126.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9f357ee0e16e2e5e09fcc5428751a16/gozoma.pdfIn PDF document text
    • http://rubensova16.cz/files/file/38175232129.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083c31502827---katuvobab.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d56461f05e9---42921783271.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/76424849992.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8d6b898a4d633e8450350f51d60a5ced/36160981959.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/rirobiwilovezu.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/23215183749.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7de7341a6e7cc0cc37e05a77b2fed320/84665591975.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/010a13812cd0e4a41910c1b474f63f43/juxujeruvusumunaka.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a1fb2cb867041553d9d6748b56ba22d/lijapuvujidu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbbef06d5---gumezokanunexopazasilu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/56f9e48c3b0be0ed2c7506f46feb2567/murixuko.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b72c6e38---65226174743.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb7fb0502---turetatufiwazidilataxukid.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bafbddfbe61b5a48409b683437452f71/498072719.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_off000131c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 10616 bytes
SHA-256: 22efae7ebfa972f6c4f1188f606b3818251097efd7e820579de7c931aae4839f
font_01_sfnt_off00014a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4B 17760 bytes
SHA-256: d0db8038d0d4c69fbe570eff43625b9bce57c39e3cad211b34323c5fc7761514
font_02_sfnt_off000178cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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