Malicious PDF — malware analysis report

Static analysis result for SHA-256 06de83896ff143bf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 18:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c509264b20d3ff67a7ff25dffe42549 SHA-1: 68bc727a7c0092eda2d7238d624215327daf4f29 SHA-256: 06de83896ff143bfc01912a62731a3ddcecd232eaa4206be48775e83a134ead4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms pointing to various domains, many of which are hosted on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://irlanc.ru/uplcv?utm_term=cricket+totem+meaning PDF link annotation
    • http://mehmetrasimmutlu.com/icerik/file/nopimugawoxoxutawa.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gumesabapofibuluboduwu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/64069602132.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i86pmnj1cln7tv7dhgeqdmq6i1/nivufaxafi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xowolobaredigurew.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/13310921071.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/26241728296.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb6739c62---wixipan.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34a3f7b9d4040c75b38ff5fb0dffadc1/49146874032.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/99199820781.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/55462922365.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/85344392784.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c75dd6c3adafeaca3633342f02bd358a/43389912385.pdfIn PDF document text
    • http://cecev.com/stockages/files/pobisok.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/zofijenajit.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/dilixofofoluzixezikapugon.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/21586935586.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/69862884368.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/49396261909.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e808e85e---tazazamanitolunibo.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10484 bytes
SHA-256: 3806737041d336fb9444a8f9917ce6936efb75f49baa8f934627093ed2a01013
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16008 bytes
SHA-256: 4620c8c46fcd8b3e34f42c024c9fa8c6e5c3e53b66bbfe299a987c4d5e75be65