Malicious PDF — malware analysis report

Static analysis result for SHA-256 e602f2dc748652ef…

MALICIOUS

PDF

84.2 KB Created: 2021-07-10 09:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f5620fbd7fa9e6174a572f96630b8917 SHA-1: 4db41dfbe31bc406aa2337c3090a124e8f14f6ae SHA-256: e602f2dc748652ef171a79e7ef86946b105d1fa0f2cbaf45fcf92fe3a9a187b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests it's designed to act as a link farm, potentially leading users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=beauty+and+the+beast+quotes+1991 PDF link annotation
    • http://vtvxm.vn/userfiles/file/49676337786.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e48c4be31---75348015730.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8898c0744894886c38e5b12bc7091503/pixujetivoxewiwu.pdfIn PDF document text
    • http://sns.hu/_user/file/4475478617.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/bijufagozemalexunalob.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tasibo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/c1hh10upn9rmv1ca3qkc7oitim/49249320525.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/24018674004.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/fugeg.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/4156536541.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/032b2b24a7f609afee4a1c6271ba5eb4/32219706810.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e193ca19---wimefojugafolomaz.pdfIn PDF document text
    • https://impresa-valli.it/file/kukuvunita.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c628ded7d88c3b584f25ba6d764347ea/bokatutesunejaw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b676391db---sumixusikiludim.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/nolitilitepexenuwe.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/92843287244.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/921cb25b7220cf8dd8ff6d096828ece1/50371343713.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eec893c8f---nesowugutalokutegulamedu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/60710999491.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/70398631674.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wipevemizexevu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/89a06301d7da2be445c623e9e680e35f/pibuwurarugokakukunap.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 10880 bytes
SHA-256: 8521e9424acfafb660bcbbf7ea5b5a6cae8a2f8e2389e61413f3ef0463801198
font_02_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 16356 bytes
SHA-256: cf9a268f1bc56c2adfe368ad262f724f785b5e69fc1875c32794eafdc760863a