Malicious PDF — malware analysis report

Static analysis result for SHA-256 98535f806bef7e9d…

MALICIOUS

PDF

91.1 KB Created: 2021-07-16 08:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8c6c17e54528be517909f9455c7b79f SHA-1: f62da0c794b7c5b0c0457dc4138d022777ff3121 SHA-256: 98535f806bef7e9db1c106d26140b883782e467592b71f1deca398c567fcbab5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://urbanconstructions.org/images/uploadedimages/file/kakebuvorogivera.pdf
    • http://raylutickenterprises.com/userfiles/files/23095809619.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91e49d20dc19d1cd006ca535fc75523c/lipiberobegavinulur.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f74e615add---latamojopusijaxejipujerab.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/gikemi.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/52451994125.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d04fbe8---7668915922.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef34715fb4---11577779315.pdf
    • http://brenno-tojestto.pl/userfiles/file/fiselevanopafatikaze.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1faeda7921---27260866270.pdf
    • http://agcslohian.com/userfiles/file/rudisakelo.pdf
    • https://aartipalette.com/userfiles/file/39452564196.pdf
    • http://sva-jeanroze.com/xmedia/file/91114847426.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8d3d0b0ebvqfctccacc1h3k9n0/gitubaxewefikadalikuxil.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd1a032cb---jogajomeseruxuveso.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5b7ca635431767ed399d1b8e07f32415/24274490109.pdf
    • http://bacviettech.vn/userfiles/file/tisasewewikezapateliregis.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/64acec0e2c23c25707cb14a3bd96f2e1/lisogib.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066181ff28---wuragedolurunugog.pdf
    • http://bukhatirhomes.com/userfiles/file/kometolezex.pdf
    • https://alice-immo.com/userfiles/file/novelu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=si+unit+of+work
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010156.bin
6bef9d9101b0fd734cbe2eb53076ed588f3161611d2e55748196b3266420ed4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10052 bytes
font_01_sfnt_off000117e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16792 bytes
font_02_sfnt_off00012ff4.bin
5d81e10cda00dd0936733d7748a211fedf06ea52270e92abefd8c13ed1cb26dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 18260 bytes