Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82517463e3022b5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 23:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7207ab6c80afbf04dd8f10957508e84 SHA-1: c6e907cfa96113222f0406b88ba4372b31187c89 SHA-256: c82517463e3022b575006125b7c4af1853c0901dcd3ac5ff611b0704ba59ffe7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and external URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://simonide.org/userfiles/file/85624767033.pdf In PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/98646969676.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252798542---nuxepasinovofas.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/79574714554.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/falefigetedefebivejopelas.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c3920fd2---fimumede.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f2lhm07cquabkeqhonica80lu1/45512643367.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e62e5bdd4---94794951435.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/84710924813.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/ladakorix.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019f1a6396---bisozapapoti.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f734598b8---nufozekupanapebodesezib.pdfIn PDF document text
    • https://cargobull.cz/res/file/32232580700.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc84f310854---24433928885.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0448cf652b54ede30926158b0f800590/nupefo.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/53282936801.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/99098945395.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/6132316732.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6284032efc---40700247601.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/11298508569.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185b2b39ffc---31895528129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=phrases+and+clauses+quiz+with+answers+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_off0000bb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 16672 bytes
SHA-256: aa43ab735beeaf5067b5636898463a01faf6b416bcf351d3dca095c8bfea8971
font_02_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 10992 bytes
SHA-256: 7f700ad41f45bb855e1a8f4ef338e083c02eb121c36407b90c34c024010f0b74

Open this report in the interactive analyzer, or submit your own file for analysis.