Malicious PDF — malware analysis report

Static analysis result for SHA-256 f260abca64ef2fc7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d7f2789ad87be2426fe095012fdfe72 SHA-1: 4e6c1ec9ed61de19f0505af2cf660107e0f841b4 SHA-256: f260abca64ef2fc7dcf85a76575df372f1869257f264c8ca06f19216b35ba871
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 for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=english+filipino+dictionary+apk PDF link annotation
    • http://phongthuydotho.vn/upload/files/93786827670.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/tosik.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/36588725328.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/xofutamozomatevuw.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/75705084885.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/28040628920.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/fefutizuretegunewezelox.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/xufubipijisevog.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/2215968574.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc183df6d6---75431748744.pdfIn PDF document text
    • https://intersat.lv/files/file/51934735868.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfddc2bff---rusovipunozolozufor.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdfIn PDF document text
    • https://tepihtrava.rs/files/dadajijuruw.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/romovenagapawuzevo.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekigezubetowofik.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/48373168655.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vepemeripepe.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/bomujufi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/loteba.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/9222421813.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/on7dnvhmkiuu1gsi8g1npgg6ce/vovagujibavebonevev.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nezezirawikuvobufakoxuxu.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 17636 bytes
SHA-256: bac4b13677c2500514e2981b5c1cb77d3ee081102c608816cd3a8835b91e30d3
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 10956 bytes
SHA-256: 663d3e7ce835114e6634e804983284a0f1716b3faf57c5ed891ad8bf1c9d8478