Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef035d3c7241557…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 20:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f4ec5c11154f4c811745aec2ca59bbc SHA-1: 433718893d5dfafe754d598190a81580c0c1e940 SHA-256: 2ef035d3c724155789baca572e617eea9f9334e66e272bea723bda49b9eed86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://djk-winkel.de/images/uploads/file/bumotolupafevikuli.pdf In PDF document text
    • http://burfel.ru/upfiles/files/wepuwu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wakorerikibegox.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/bamiloro.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xinurojinopalugiresi.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/nalexoferedaregit.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/razaz.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c034e826---16193463923.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2db64eeb802a59d30eaea04232c105f/fikataliguzif.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/18777828401.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/69954579663.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/84084778969.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210927220618.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613964fe2ec4c---34164474088.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/51166376701.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/23705922401.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/073a1ff8f9bd6d33040f18175bd097d3/letemegimekapefufurovi.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pexofuve.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/lejirepetemew.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wajibafozitazukikapuloxuw.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/gorarunavesimuruxata.pdfIn PDF document text
    • http://jarosi.hu/files/file/26045446798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=drupe+caller+idPDF 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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10120 bytes
SHA-256: 92531349baac07dd7906991d79f15325120069cff611a17451d3c967a7b59e7b
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 16452 bytes
SHA-256: 57e0ff3fa1ed7e68de1af5cd962f3303e133a8f983eb3f81c95ff1f7cab0c532
font_02_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1