Malicious PDF — malware analysis report

Static analysis result for SHA-256 8769b108de898a86…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 02:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 333fedf475ac4407c8e6c733103c9a4f SHA-1: 8f977042ddfacbb59b67d616bf70c74cc7777ecf SHA-256: 8769b108de898a8621754f847ba9dd67cf89b5926c1017de23d234be58f12e6d
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 or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://catamma.ru/uplcv?utm_term=calculus+early+transcendentals+8th+edition+pdf PDF link annotation
    • https://dukra.sk/editor_uploads/files/zigapifis.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907181024.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/47888548042.pdfIn PDF document text
    • http://shamayachts.com/upload/file/rarixufavikaxoliw.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kawometulanusobew.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/94548921735.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/57002946677.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/lorudomir.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161319e0ac2a04---81147619136.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f42d774d9---29781588122.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/43244605714.pdfIn PDF document text
    • http://askort.pl/Upload/file/18909323098.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/wavimujevarurowetinezafo.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/girovolelekogafesoxujug.pdfIn PDF document text
    • http://elpijisystem.com/file/19956821072.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/707469549.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4ba8c742---xizipo.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/33256521139.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/49447114506.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u67etlvpu3f8h9dmlcfmc97h2r/garegiwefixupiluvin.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b022b74e8---winalezewododeji.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/dojuz.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/93815965631.pdfIn PDF document text
    • https://elemonbg.com/Files/File/guwumifawenilo.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98237272126.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59739932713.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/majaderotumude.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_off0000b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75F 11172 bytes
SHA-256: cc82068b7ec71f6c5d601d1381bdede2edbe381e3d3cff18d2ad58817273521c
font_01_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16200 bytes
SHA-256: d22d0789d885d46234d63afb4d4ddef6bbfeef2c0e1987799cf9c009bcd966bd

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