Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1533bab8776725f…

MALICIOUS

PDF

69.6 KB Created: 2021-06-09 07:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a4be750c094d5df08b98326d8b42f7db SHA-1: ca9042079aaa6cf5936bccfb6270f9c0857ba083 SHA-256: f1533bab8776725f0d7a1b5eeb6f70ab80040b0340efe2a7fc2a2da93705f6f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a URL with a 'watch movie online' term indicates a lure for phishing or malware distribution. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=watch+kaasav+marathi+movie+online PDF link annotation
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf979105f22---mapenolopo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d110dc6b---kavexopumibagarenon.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bc700c6b080ef7bc1adb190c55926348/wovegavo.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zusonefosajadiwesunomoxut.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/53775324227.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hi46p3dueafsr7tsh4h5db40o3/joxakotisotifosap.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/61950777675.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ba919035fd45a8db2da589f414f53abb/sisetovokafijebo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1c146e84---94711603313.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4d22697b---97511914958.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/85c78tf8sicubsc2a5h82rdfl3/girelamopafimodaxebesus.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/90c432b8fc5cda0d0ed79eb5d52e46e4/tobekig.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58b77fd06fb3c969213b796df83e94e/petusujorapip.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11c0007bef---55092910725.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba256ceac5d---84391317544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 5176 bytes
SHA-256: c081096cdf84e964a7010558571cc2a2f9b5781ac134eb9b82363c96256a0cb7
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10716 bytes
SHA-256: dbde859c331b433aa3850be82c84d73864594421e758ff65ff295e66c65be882