Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f71ff4e838d49…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 18:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24bae842c537643bd2022c36ca142e72 SHA-1: 1f73e74e3f2d52f69480048958055b7fab9c1c0c SHA-256: da0f71ff4e838d494fa30f0654956b0b1a61208bfa1e62cb4a385999a6bc87f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pixomot.ru/uplcv?utm_term=screen+stream+mirroring+download PDF link annotation
    • http://mtreurope.com/ckfinder/userfiles/files/69404482692.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145a76310c26---46115669548.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/49640824117.pdfIn PDF document text
    • http://kisito.com/userfiles/file/50638137041.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/27604400149.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/64ed14e1d30c8a8c04be7f4930f31b2f/71465038703.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/fepupozirexisorujako.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/97577373652.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/22501934825.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/55849047327.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/66389703747.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/zumapazexajesufugafetuj.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140971fe53c4---51350520329.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/4263708358.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/18347316198.pdfIn PDF document text
    • http://julianina.de/upload/file/72345564345.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/28123560063.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a9dce5f---rejebob.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/vavokisuvupufuzav.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/3375500476.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf0989ec7---xedorufor.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906130705_2140775848.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/58718736348.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/46158606612.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tewapadezu.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_off0000b4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 10872 bytes
SHA-256: cd01597bc5220a16f1a9a77724a392c1be224384134d82552d1b7323dd911870
font_02_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 15360 bytes
SHA-256: 824112b669dbaa25257140d7e102d5a3860a52a3f562ff9a2d4fae6b6fa31ccf

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