Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e24d7abdf2cb4…

MALICIOUS

PDF

96.3 KB Created: 2021-09-01 16:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2be55b8a084e5f65b67fdd10331531d9 SHA-1: e17cf20c78751149d10792cdf4802684b159ee3c SHA-256: 940e24d7abdf2cb4ab229f40a3dd9f655aad16e168498ae6d1c4aa78e758b6c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=i+have+had+diarrhea+for+5+days PDF link annotation
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/54238679372.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/fubugunoramolutamireb.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160789a8cb408d---84226942519.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/95512237895.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cfb4145b---8882039581.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/juniwaxo.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wovotagivimor.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/viratasijelela.pdfIn PDF document text
    • http://winso.tw/userfiles/file/73058560047.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160865c5312495---40825218222.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/80258551170.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oegtl4t1b28euu572qt8it0gap/67616006750.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b3e0276f---59592298498.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0be94cd3a6a87a11028ccd08d27c64a6/numedupuderovabimu.pdfIn PDF document text
    • https://digireg.lu/upload/tidodujamim.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/88314325306.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161262ed1cdaa4---tuvinomuvubulajaluz.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/ranojolavevibulirofodane.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vuzenikigipesugajogupebap.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/41266745983.pdfIn PDF document text
    • https://soechi.id/userfiles/file/40966049501.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_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 17152 bytes
SHA-256: bb4c445728faa0078b75bb37def2b4fa5221158985db9fc41b2fac20bed975c6
font_01_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 10468 bytes
SHA-256: f688165bb4cfa0826f865fdeea7d8152872956a5954a8ce2f59c1cd46eea2fe8
font_02_sfnt_off00015ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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