Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbb390252685da4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 03:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c68ec0e239b25b1d43907dc79c1126b SHA-1: 168eaced7da861760115f017605751d1cc65fa1a SHA-256: 3dbb390252685da4318d9d3eb4d8f769bcfd091824604bd6910fc6aa3f1af9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=kill+team+elites+pdf+download PDF link annotation
    • http://hyundaihungthinh.com/uploads/images/files/93488443489.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/noxomaka.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gipuromuforitalezasa.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/10947579942.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/80712242621.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e9c12382---vonapunusawoga.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b657831f9---mokazinovo.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/tewiwobilo.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40863701853.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/55038196680.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210913110924982036.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/56813686471.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/6942343424.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcdd96174---65618974110.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/65339066201.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/nobojikogosisevuzevez.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/gimuviguxajibagitudoju.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10133073770.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/demupes.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/lowojolawixiliwenu.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/pebefowideka.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/dunelumewimemeve.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/82171096220.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/durokaxaruve.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_off0000b64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64B 10636 bytes
SHA-256: 5bce9d4a73a9c2e1fcfca819c67eb54bfa92d38f1739f4012a9908aae6807c96
font_01_sfnt_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 15808 bytes
SHA-256: 88068df5b8765d5ad7c2d31197c8c4859a96503d08c6f04cdbd30af2fa49dee3

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