Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f777cd955f7d065…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 05:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db98ded5507b2686eca5ee87ab4e0a32 SHA-1: c0977f834cb90de7296722b6976ee8904bb6fd07 SHA-256: 0f777cd955f7d065d4167f2f4cd7573ddab884bfce3e67e5541351513998e173
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to compromised WordPress upload directories 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 external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cheek+cell+diagram+labeled PDF link annotation
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57076973755.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d091b6b35---xifitof.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3ae24c5830802b10371a6a15b805cdce/91529445747.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/93417447195.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/42680344871.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/matizudatifewabadelusobe.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/14415211890.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/21733bb113d1a6feb34e3e9ea1a58627/5782216770.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/54564354137.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/vududipisubukeleneje.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0dd01va06pqvrher7i0p01g3p5/mosofoxedikijup.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/73576403883.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/53867965335.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/o9rum1hgslqibupdtk7h7u3s25/15001969564.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/59059440556.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/82954409156.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e19a27cad---dunajototojosanetunenup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75917e00db---3023676800.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/nqhd4k8mmn4somq220ujeeq1vd/85649400618.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/19/75409313673.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gp3g1kgl85lcelebgti1e5mmbk/607632481.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257ca536ae---tivaselisegu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec720f1b7---fizaduvazowozi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcc854ecd---fezuzirasefavofivebedakek.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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 17024 bytes
SHA-256: 939a49ea31cf93f1aae088a18fe85a1fa18a921e08528ebb23ff539da13ba92f
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10588 bytes
SHA-256: a258db1358fca3da7039e5ba6c85dcda076daa872c1b4e079a6fcfb64255c239

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