Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bde6b4dc96640b8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 21:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2af4aef18e08d7cc340464ec7353ae5e SHA-1: f18aa7f89514d2d0f014219c6c3ab7b5e9f11103 SHA-256: 1bde6b4dc96640b8ecf5258ca5da5c1a6cb01d006c3de756fef64e11a186e519
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://quartierdete.fr/uploads/fckeditor/file/ximuximelemodi.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/tatevobipewe.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/11237119292.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/45530643837.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/vibidobesajitokefa.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/54061572758.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/panajem.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/dojikaraxozaletofe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/08fe181c42a69391ea5ec759935ed762/medodolinuxuxujaduri.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa39a45c---rilozejasebitemasagiliju.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/54001532357.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210902223245.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b69ef21---21811482021.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/94573639995.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ae51fa3b---jakijelakibagazegoruz.pdfIn PDF document text
    • http://moristas.com/userfiles/files/89476151996.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/gunutazefepi.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77343565743.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/57511372152.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/vigazidigewu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/16537279019.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/radodajodevijegi.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/sisiveruporikeni.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tujowaju.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mujilimu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021932115234139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=facetune2+editor+by+lightricksPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 17460 bytes
SHA-256: 5d91cf1fd950448033c5d0f0d3a0448a5ffd83342791ef443574cd4a0df3a8d9
font_01_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 11192 bytes
SHA-256: 909a7f7268abe44c0f447ee0508f49630ecfdb47f694310030d19410d6b1dfba
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1