Malicious PDF — malware analysis report

Static analysis result for SHA-256 8399bbdb0d25d804…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 09:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb30184ce06aef7877521d07e4483c27 SHA-1: ddce6b08b6302929e0a3570411d79522847b4f2f SHA-256: 8399bbdb0d25d8042c1b2aa4bf6492de391db436fb9eacd9e2cb94f461cb2157
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised websites and disposable hosting. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5314un98lg3nmacmmro9faf3g8/lapugiwuperidisovasex.pdf In PDF document text
    • http://abwsalisbury.com/uploads/files/23006446483.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161464c6b061c5---39333858865.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/40891859206.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/rasufofelanatajefugexi.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/73489298336.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/renejalakiwitig.pdfIn PDF document text
    • http://wamer.org/userfiles/file/dujefixediwipow.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/tageridanubesit.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/79555139018.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210902122407_487hl6.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/91602878459.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lujebufosofep.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kazikemeni.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/22397938558.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33902f59d---gopavuvoki.pdfIn PDF document text
    • https://mikludava.lt/images/files/56623936831.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21858354422.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/82048478114.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/jipijifogedi.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/tamonajej.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/jatut.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613587d9246a5---kojuvoxuzebedajomuxasow.pdfIn PDF document text
    • http://egitara.com/upfiles/files/15512312833.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021912052572478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=basic+organic+chemistry+book+pdfPDF 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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 17336 bytes
SHA-256: f47ed345a3d743723e946ef1a27b7c250023f15b4bed88bbaaf69ae7f202b157
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 11420 bytes
SHA-256: 91ae63c8ecb78fc33f0a827ca4d86d0e3a41ff5501341efef9cb9fe62366766d

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