Malicious PDF — malware analysis report

Static analysis result for SHA-256 5accd7bdbf61ef40…

MALICIOUS

PDF

88.2 KB Created: 2021-08-06 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6fc9384efaf9035961c92f53b6024c6 SHA-1: 47b826faa0ab97d817521dc637c5ccac7ac70a24 SHA-256: 5accd7bdbf61ef404ae11ed3f25c577690d5bb78c29e0bf0742ceac035666f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=what+is+tapping+in+structured+cabling PDF link annotation
    • http://stardentalcare.org/userfiles/file/bozotaxoxonorewekoziz.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/posawawazu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/62735098008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836183478d0---47030306221.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/73932125564.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/45042537470.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gabojoma.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246fbc9263---ditamubib.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/69178608481.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106929995840---18247736941.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dec21b01b---24129580625.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8osv41b3a0pllebb4vcs9mjbd3/20760751419.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/tubawemexuvilepi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kinou2i90mck5ihere2rpkn33f/80786014282.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31fdfe930c---kufewepuk.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f0e3a3a4---xetoxamugeko.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/teduxejixawurokeginaxage.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/48349769467.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pfm9ch1u7c34m4k1h3ul1b3tok/tuvawalerusufuj.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/113af300cc461140b5707f7e70932c02/70199755630.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9834009665.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/14065798652.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/10717526943.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ef10eadc4897af67b26b9d1b7fe08f06/77858905839.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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10908 bytes
SHA-256: f16885dba8168f78150078470950ffe2333af37e4696230289dfa58ff70625cd
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 17244 bytes
SHA-256: fa04691cad66290928e4b50375baaf7c7592613dc49a2c4cf4387749521b26d0
font_02_sfnt_off00013a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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