Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1fa7fa6a61896f…

MALICIOUS

PDF

115.7 KB Created: 2021-08-01 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cecff91c311c0a4c912f6ff3ac02765 SHA-1: f92914d634084328249e9c8d29bfcc8e2d5c19ff SHA-256: 6b1fa7fa6a61896f1bf7e18e27d614b0b594b50b0b11556674acb453bf29b598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crysiq.ru/uplcv?utm_term=genel+muhasebe+1+kitab%C4%B1+pdf PDF link annotation
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82eeb8596---51080256340.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/16895563090.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c0fada8072436d52a3cbb0357284ee34/34580046302.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160966bd390a3f---89904654218.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9e05e83f---33166847752.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5b7afad0---29069983330.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4435ee70a---73931385267.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/jufodir.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e834b114fa8---64415262700.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n1ifut8i5ui3134trk8ag0qvo1/biwexozoluva.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b80983d59da2a9900bf2e9fe94613324/faxepaxizapob.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/um1ovbhmt691hcoi5jhsan5umg/26365953133.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cade12acb---foviwumubexalep.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210627_BE2F23F9B750382F.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/28363589217.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/somusezupowof.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/8f415a3ac99fea14fb86f8f03f0109ba/91001354070.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608166e97578a---resuwajusupoba.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/gisajiluduve.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/3714787398.pdfIn PDF document text
    • https://drlanda.hu/user/file/surekigulejepanomalutamo.pdfIn PDF document text
    • http://agrion.org/upload/fichier/15623053397.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3e181bc45ee338c3f3da573cc59aaa1/14102925844.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/41666214458.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kananizokafoj.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_off0001604b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17862 11012 bytes
SHA-256: 839c2800967bff9a61ae81188619b104bafb6406d281b9acbc63ad3d28db0fa5
font_02_sfnt_off00019185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19185 18384 bytes
SHA-256: f836ab058116453b753714f191c4e10a1105cfe4265ae3bdbcb69edc1c30850e