Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99cfcf77eec5b81…

MALICIOUS

PDF

70.1 KB Created: 2021-09-21 21:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fc91b3d3df1fe9efee7948fd9660d3d SHA-1: c3b4ec5dbbaf500679f66a793e6021ab11b8d570 SHA-256: e99cfcf77eec5b819aa33324ef6c5d58d417f79c57e0acf26d1ab71b27140a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing and redirection attack pattern. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://huntic.ru/uplcv?utm_term=guardians+of+the+galaxy+apk PDF link annotation
    • http://blankheich.de/images/uploads/file/5683588496.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/ledizinumatoraveni.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/98655674813.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/lekukagevupobe.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/82762078022.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/wasijunerurefoxilo.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/renunomozupuwaginadovasuw.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/85070589872.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/94940891692.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/78966312919.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613967ec03564---48737838378.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasozezetuwanurujalotutij.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/felaxozuzunax.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1184d40a9---47831428997.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907225515.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/xokokoferob.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/61322395397.pdfIn PDF document text
    • https://soechi.com/userfiles/file/92136360457.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/vofefobafudinoj.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/17981399542.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/54472858186.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/fukow.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/74397443676.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/91577582686.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259d759ae---1232884227.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/kelabugimawopurifewapagug.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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 11224 bytes
SHA-256: e755230ea8085f3037fb95882e01906f8bab96da76212b255d6f2c590d11ace0
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 15292 bytes
SHA-256: 47af988ed81e557c3d727ac1a2eba654133e448d001dcbafbe9065fd55944009

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