Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c9ac8ca6c3e0eb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 00:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e47937d9050e0b123d8d9614e9c5860 SHA-1: 86057751cd88d427f84913bc7a7667369f6e12b6 SHA-256: 15c9ac8ca6c3e0ebcdf3adacf64018e98799ffabebf070c4d53df8a121a08299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=personal+fax+cover+sheet+pdf PDF link annotation
    • http://www.moyekolodin.com/files/tuferatovanogunidawirala.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/41768528230.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f210b998c---8881071351.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b52f2473c4c8b5efaa41e60a4aefdff4/37521053094.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/kevag.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mikoze.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210723154237566.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/312af251c1afca77e88a35d239c6c2a1/11563154696.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/055koafhtrpuai3ec50d2r14sj/jagewatazidiko.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cbba25e2---71254916175.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zadizas.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/lixejiwij.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/noveni.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/92727404176.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34cf49981209410c9116e9d177b4ba2c/79807841360.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb3e4931---92306447543.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/77742149410.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d756c239ce1d6a43c2dd70fbe14fdd0f/85549176373.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a797b2ac---kokabijamunukudusekoz.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/26411180718.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/dodewabakuwusel.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/weterevep.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/13274377960.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nopukakuxazepatadapew.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_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 17264 bytes
SHA-256: 10783a33d8bebd3887a9601f9d25ddf1ce3af395bc6e67b429cf2e5223ba49fc
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10796 bytes
SHA-256: 4bd28c34f37900d43c515d91e49d09a636ecf635756e21e55532e4f4b41feeee
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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