Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f733dc117031220…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 14:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffb97d9e617622b46e8364f7f137a6d6 SHA-1: 9ee196ec534cce26ed9915413919c79c2f55626f SHA-256: 2f733dc117031220fcb2beb277c536e960bf5c138ed101148b264611c6dae266
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 websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zusisekasizoroni.pdf In PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/widasuxofoni.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e8f86a3874fc39162bd4c9e8b6a041a6/baleritekopekuzi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/39083587123.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc207e3870---dubafeviwiru.pdfIn PDF document text
    • https://goodline.by/userfiles/file/95894810813.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tewodozi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5aa8f430cb5b9be0deebb1cb3fc72869/ragonurewidezepowalefubax.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1481d5176---todobagodasitula.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/jewajuxiruv.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/19cf2713bc88ad6939c6b765388caa48/65122318662.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842343e400c---minosik.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/getudusaxupafu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/14862321848.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/96e63a3f4b8dae00ae9e5dfe72252ac1/lawekalidadinebamurolujus.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7631e43fab443317afe620037a6f8585/gixitinokudir.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/54704201210.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/56203933684.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/52456248705.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/32124721015.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/wipazarobow.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/jenebo.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/pizolekometasa.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/mewiwosaloda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exothermic+reaction+worksheet+middle+schoolPDF 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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16724 bytes
SHA-256: d507946b7ccae14efd8e49509532009e1255fd3a26d3a29a51a40669e8863b82
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 10896 bytes
SHA-256: 991abe220418059db1a51e196aec45579a2aed58eba9a8be173883640b701201
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1