Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65de5b02e7fa2e7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 08:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 962dfe70389e485851ed75147f062979 SHA-1: 41f985a46fbd5b8e1e21ce9191ec9b739fd8aa12 SHA-256: f65de5b02e7fa2e7ceb45f214a414100c612ff5507eb12b4f02ff7271c51a6fd
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 websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=mindset+the+new+psychology+of+success+pdf+free+download PDF link annotation
    • http://language-coach.pl/uploads/files/21990820839.pdfIn PDF document text
    • http://pactolous.hu/upload/file/82493114782.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/99062921553.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/jatagodakavubipir.pdfIn PDF document text
    • http://moretonassets.net/userfiles/vojimujijanevigijimi.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/felavupudodolunesoz.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210910_BD6ADD7EB82723B4.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a2160daf3fa2b5f501d9ea44ac4fc0da/26085911413.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139299733500---31920875790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8824808---jujiw.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/wigexokixije.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/14818102683.pdfIn PDF document text
    • https://tigaintan.com/contents/files/lutipebesuviw.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/pavisujivupalofuwowa.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/39907660675.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e40d6c0f248d5f9f032b215293ab6a90/25100810440.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/xameremanozuledu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/89926232573.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210915094431.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/34964225828.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tupozusosekiwowizexur.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/27703695667.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/pesukapuxiva.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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 11192 bytes
SHA-256: 34c045dcfebb7384328e8f23a6ca2287d9a3ff7fb7f6865f79f2c338ca0fe0f4
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 18152 bytes
SHA-256: dcb2cdfac4d8f265c10b825732a9a52c3e038f58ab989c934cd72dd253eed8a6
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1