Malicious PDF — malware analysis report

Static analysis result for SHA-256 273bca1ee05279c6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a52e664286d0920e105e919a9a48ada SHA-1: ee557334f0e7ac1b04de9fea0b1d65fa877d5317 SHA-256: 273bca1ee05279c65dfc1ffdde934e85ba8a372179df2f198ae3de48d5811f83
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=bella+cash+app+mp3+download PDF link annotation
    • https://demircanticaret.com/userfiles/file/wofujizunobik.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/bijifibeduviluzez.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/zewavaga.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e5896551---51071373478.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wepologopupunu.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/nisuzam.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tedexuvepikopanipafeje.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39191594234.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613647be69a0a---15900602382.pdfIn PDF document text
    • http://mobiliteit.nu/files/lofulep.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/67105916011.pdfIn PDF document text
    • http://trieuduong.com/images/Download/zevuxawozagimudokir.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/17756636246.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/2289448476.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/59381903216.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/84577519270.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/3223037632.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/73374805523.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ea475f3356d45540cb93755be7c90d0f/jibekasuvoxove.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/kasifanizosokejofitokoba.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901172444.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e48a2a20---kawasosu.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/80714746421.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/16830389.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/81251911447.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/86125379812.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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 17788 bytes
SHA-256: 19823082eca12d2a5415b6350b73b1ff054e15836c3e8f851122f59a6963e46c
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 10800 bytes
SHA-256: c163f6b7ab4135af3d3a369a6077ff9559bf1b80e307dd70c9c5acd86edf2975

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