Malicious PDF — malware analysis report

Static analysis result for SHA-256 65982102d3ddc319…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 18:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9b80055d8622ca17dc3d8b287ff0071 SHA-1: 29ff3efbf2446f334385dc3ba63e65b30e3a602e SHA-256: 65982102d3ddc319232bf3f87469b038e2565e8adbd0c08b3f829184a2b87366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious link-sharing pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nomylo.ru/uplcv?utm_term=gokudo+city+mod+apk PDF link annotation
    • https://biorenta.lt/ckfinder/userfiles/files/lutebufejizukimofitudune.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/12476157669.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/55775507881.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/81236952609.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/wifibuxepugerufotiw.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/19555848444.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d794p3u53uq3005cl4grdv6i92/27026753341.pdfIn PDF document text
    • http://minipit.com/data/files/13822850506.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bebiridoviwit.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/31469700262.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6e3rhed1of4e5k62epg99aeigu/roromukinibezasixire.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/55803496919.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/jobirebifipazaxofibin.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c0494b0804992702e744eda33fabf78f/debibiwegufulisemibap.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fokikakepiviw.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/89232576628.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/41279024401.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/65025902903.pdfIn PDF document text
    • https://priscar.com/documents/files/sefemijikovakonu.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/94828341862.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/55789034733.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/dimepele.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_off0000bb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10472 bytes
SHA-256: 7d292a17ee8577066683bf7892d8f07457b5cb4c717a3ec55c06961fe3f7026d
font_02_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 19996 bytes
SHA-256: f571b296ef985785e5c9b6b7df7865aae12448e9eb564990b0509e6f59978995