Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a977a7902f7b2c5…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 07:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 212782ffb65870aecf4629d2e8b8cf93 SHA-1: fed06c7eaf8854b33a979ec7d697e2e23785d35d SHA-256: 5a977a7902f7b2c5c2fded9716495f31dbe036a4459a3a11c13775facb1a8a72
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://e-ceramika.pl/userfiles/file/4823512338.pdf
    • http://odpadykj.cz/UserFiles/File/ronobimovusakuv.pdf
    • http://vivo-mebel.ru/upload/file/xopolubetadujiti.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/83097022638.pdf
    • http://malagi.pl/user-files/fck/file/fegajo.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/kakoperabovop.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/7925454408.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d753af987b4---mofudelefalekul.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1af71d139---57603986666.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7ucoj78eu600b43p48f7enesc0/98901619496.pdf
    • http://redeyeldn.com/userfiles/file/25801264033.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5e98478e8c3ef2ced3f86d3844beb5c0/dinuxewa.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/46pn0f0ekcl43k6a51cmv8nl67/31142853318.pdf
    • http://csc-021.com/userfiles/file/20210803074903_1egyyg.pdf
    • http://akwarella.pl/user_uploads/file/37912234219.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/9759009560.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7sl7amd0rt3uk1s98bocqk8cio/9241307441.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a33a3921---nebifodisuxeretatinumur.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/18173041642.pdf
    • http://curry-box-deluxe.de/userfiles/file/40019365945.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716bf6e0af8---wukitutonagurapefeg.pdf
    • http://burchiellati.com/file_fck/file/tamur.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aff6784f88f---nanudidim.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/cb36b3eb010d07ee11aa3224cd4d5ae3/vimebe.pdf
    • http://magicfood-cn.com/files/20210624070756.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=present+perfect+continuous+examples+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58d.bin
04532fa39774b496d50001e6db278863f1364f1e36edc0928635884262b3f4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 10984 bytes
font_01_sfnt_off0000ef17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 16792 bytes
font_02_sfnt_off00010724.bin
b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 1868 bytes
font_03_sfnt_off00010fd7.bin
5e84ab80dda74160506d6a6ece009d2206d3c029ec003d82bdc9fdbc522e3586
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 20896 bytes