Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb761ad1955920…

MALICIOUS

PDF

100.9 KB Created: 2021-09-06 13:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 163c674e50bfed20e6b2237a433f04d3 SHA-1: bbf4b71de9b60eff02336309fc871078ea93bb1f SHA-256: 91bb761ad195592002d13d2be237ffcec6d3d59d4cf8386930f02bf366f1aef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2b127b0c00daec0fbc85171a842c8591/zilovevuxerametirozepop.pdf In PDF document text
    • http://allaboutdowney.com/userimages/zoduti.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/dapexikamuvutasepo.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v0j92766nvgnv91cmg3b1t1u1a/99301310269.pdfIn PDF document text
    • http://fxmeat.com/upload/file/769e0206e8bad5705b01c2da45c71be7.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49180256015.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/97cee91f2171866b082a29346541099e/51119885738.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/11192919248.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mb4i8d0qbku2su77mhsc428ul0/87881359929.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/pature.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rexapu.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108142158218884.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/sopuwudorowuwizoxigol.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c792bf6c2c34d59d31be453d3d861df2/22823970144.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/43050357510.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/tavuloveguwezuxubipapuz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1q1nbs7ksgfk9gjanfu5ckgnc/tibizozadijumoni.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/40a9f710f70b91c9d31d8f417229ddf7/fixolesidi.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/43996426634.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65df4b0ae2---jexebiladujifiwurebigaga.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e6c2a104ebf271acde6fa15ec25b407/minebujazilax.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hs57dbuck9rceibi7evkibqfpj/89944375746.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xowudujadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ielts+band+9+essay+samples+pdfPDF 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_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10720 bytes
SHA-256: 08d365f44d5daddffc78a07d8e42aec04fdfe34c824dd4e562ba375ce69c5778
font_01_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 18964 bytes
SHA-256: 21e93666c23066885e8ab3d1420391b69fcdf98a07ac708045b1d008facae7b0
font_02_sfnt_off00016daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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