Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac89be407f5b776…

MALICIOUS

PDF

96.3 KB Created: 2021-09-02 16:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44b6b57c685545f744f53c4e20aa9299 SHA-1: e2787918958a84a6803e6271232c1c5da77b013f SHA-256: 0ac89be407f5b7765dcf96d53301f7710949a2fb9de4bca0732daf348e252a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/qt4rkavbd5slq07oeio90q990l/2235265853.pdf In PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee38e4be5---poviren.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/sejodopo.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/42259644682.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/glsci341au4u8t76gppd3dvs18/jewixawefuvotipesaxut.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/75084740193.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/joluw.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/89577575355.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xoziloja.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/mogitulolagexutuvewojuraw.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fda8689c57792bb97cd65e8730bd8b78/xezujanirirolenopin.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9760a2125d---1300973475.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/94890853735.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1059893b60---kopikenawumuzepokizazekif.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/gotirelanar.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xovebajidewarobutupedit.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210720_3E5DAD75A5035D59.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5025545bbc---35779970931.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1qot1g7tqpipe8lthp44pvav24/59934070810.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f765bf6f2f0d9e61ffe07a7e9a9e344d/76445220528.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/579a0b5506ae34ed76c15dd1767f6e67/dimog.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ca13133631972fd3f76163a2b0dfbf5a/78338754584.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1c0341e9fcda16328c793073a720dc99/53360684022.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5644e4fdafe3fe51998cebe2fd8b36f7/mulumuwoxotuvezetizeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=psychometric+testing+and+assessment+pdfPDF 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_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 11136 bytes
SHA-256: 8881f116cd88a5af5914bb7ecb1e428c8ddb01c61d83f13a9ce7c9b171be701f
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 18608 bytes
SHA-256: 461396a73a838f80f282c9351f9478e11a2203f04b1ee96cff1d40a87ad60ecf
font_02_sfnt_off00015aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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