Malicious PDF — malware analysis report

Static analysis result for SHA-256 991301dfeecd9448…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 19:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b29fd2ee6e7cc9b0c906241b647a250 SHA-1: b6d35df8e72797a1a27b7c65375ee6ad543c51df SHA-256: 991301dfeecd94482be55a09876edcac433e86e692c979f95d5284f366cf40e0
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristic point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/826fe462d79127655871ac2b6f01f150/zelofa.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074706bcdb0b---femimemededule.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/14242451337.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e17f8c06f85ba05a44da534c1bd3dc84/jelutupe.pdfIn PDF document text
    • http://didula.com/img/file/jetifur.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/nofazapalazefane.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/30660831745.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/93hk6fl4rk1cp13o86k3sgrvob/89190635615.pdfIn PDF document text
    • http://ledins.lv/cms/file/xerabuguxi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/91138628824.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/19809432807.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/2726822564.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/tixuximawewika.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098592816743---86049381095.pdfIn PDF document text
    • https://iltuosarto.com/file/nomulutos.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/walanilol.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/81592480780.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/jerututu.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/remarutajizetelubi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ubjbahncp40kf1mn71a3j73g2t/wotavatojopokiv.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a40e3fcb0---22757937613.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/19810473979.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/mofijexonovewuzib.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/posemokexabotal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kaabil+full+movie+download+720pPDF 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_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16620 bytes
SHA-256: 7f4af2e90b4b46354244c63921f727415cf9c17f6a1b09d913356efe719fe69f
font_01_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 10968 bytes
SHA-256: b4690ccf48b0581c29a9676fc15e39675983c44a732304e07ef4be5305b9bb4c
font_02_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1