Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ee20a368e1d5d9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 12:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d3ed435fa203bfbb26bc75826c2b37c SHA-1: d2a8e894c878aa8c1dc95cb75384d431fd01541e SHA-256: 99ee20a368e1d5d9363a38bff2820c9c84ab72fba8d8dd6def9af4ffc40ebf9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://collectifff.be/imgdb/accueil/files/13966604868.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26999887e09e0e730a7192e6343a6ff7/15585258301.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/taxonamegajidonelexem.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/75201681599.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zinidepivamozozubafo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/c4jpgnj7qd2i9hpd93cv9uuk50/9203298688.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094fee9d912f---bobabosiwolemin.pdfIn PDF document text
    • https://strechybenesov.cz/content/jubajatina.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/parujejokezepubile.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/konafude.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/7566306841.pdfIn PDF document text
    • https://wittnebel.dk/file/katofegekubekufifo.pdfIn PDF document text
    • http://prestopc.it/upload/file/61211995854.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/depefibajiborusegiwigarup.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b030efd1f3bac9c1fed1772ba02c529e/91989378779.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/43750303129.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcb2c616a---pekesok.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/wojibefufuzirif.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663bc74c6d---veketixuput.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/21015718684.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/49873234810.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/37012857116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mandibular+movements+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1ef693d5757318a98c5749a07d3a1455/98266333069.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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10956 bytes
SHA-256: 89f5caa7cad705621df27e53e5fd7981f9664539f0d48183f5bab7502ea335d9
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 19184 bytes
SHA-256: 46f9baad5c3ba25bfc574e111ab4b65ecc4dcfe31713e3066df0ce47a8a9441f

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