Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af4fe6e0cdbe61f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 06:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb282dc612b544bc3e3196d0e667bc6e SHA-1: 4dfa88a7fdf917269d48139c5c333a1a30028778 SHA-256: 9af4fe6e0cdbe61f33d900aab22f135157a46d0f16dbe89075bb26062361d0f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://csc0898.com/userfiles/file/20210901071507_4b2uni.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/45695765751.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zoxasobogizakub.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ribegupesubijix.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/26915669574.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/muwupipuworexu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b126c36---zazodujitufuwokofovop.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/76461397629.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/svq3jlqgc4pn21to812sllv93o/53439784226.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/fikelinepi.pdfIn PDF document text
    • http://kesifveotesi.com/files/wasivuwas.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/lopojevenisi.pdfIn PDF document text
    • http://gro-felix.si/uploads/luzeteretu.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/tabewejerikita.pdfIn PDF document text
    • http://cpils.com/userfiles/file/jojirafuto.pdfIn PDF document text
    • https://profm.hu/files/file/mumijunemifig.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xusezevujeraxus.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ac2de567---84414887687.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3870df3a---poxojabevuvazeserutenesom.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090720594068.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/zixarekemusaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gesture+control+android+apkPDF 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_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 10736 bytes
SHA-256: 40a2f482cb1dcfd299112d7c177ec658374905d95d402ab46e129bd3ba6f73cf
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 17816 bytes
SHA-256: 773f78110cca2f5054aa7c71d57bd8a14e7e9c783484b9c7a99d6afef53e3384