Malicious PDF — malware analysis report

Static analysis result for SHA-256 296c95ca23dc405b…

MALICIOUS

PDF

98.2 KB Created: 2021-09-05 21:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7467a0cc9bc4e26e6245bbce9611b178 SHA-1: 0974dc06964f2b1347f9b29ae3c80c79422a3d39 SHA-256: 296c95ca23dc405b6cfaa5c442cd2a4edbcf7194039c4538db15e02dea4e9a11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rsun.pro/admin/ckfinder/userfiles/files/41990507536.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/radatimedujabewuxikuj.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/39886000036.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/zemup.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/kobasozivubekabi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/ziriwamevoki.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/giguzawarifobimit.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nojafidefeke.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/60907240927.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/nikapok.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/zemujuwurapa.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/79188310846.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tixewif.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/fagidemetov.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99222289191.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5315f3cd---buzepeto.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf099b371---71844058316.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nejawisonaxoselo.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/rigigajaxu.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/63095226915.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/90914190066.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee63ac8e1---vunodezidixotumis.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d61405c60f8c45717c5d90b1334f02d6/fupofodatipujux.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/id9qe3n88oh920fqqj2cps1j32/memukomuder.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/927d7162951de9ba19ab7284673ac2a5/78621916388.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5cd03a96349a3dcb4fcc52dee52c5cb3/farigobefevupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=honda+vtr250+manualPDF link annotation
    • 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_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10552 bytes
SHA-256: 9148d591631e8333b275fc036938482c4cb676cefa080305da2db6421210a12d
font_01_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 19084 bytes
SHA-256: b464cd682fb401f3283898371aac71c0590b30e668b78000ca61c1d259956ef2
font_02_sfnt_off000163a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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