Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d796bfeb7b8f7ea…

MALICIOUS

PDF

92.3 KB Created: 2021-08-07 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b06376b521dfc581e5b9d9669295e8c SHA-1: fe6bc76da30dd727fbd427e6805ad108ebc70756 SHA-256: 4d796bfeb7b8f7eacde0ead4fa4efee8125ebbbce5bb602a9b740fe960a4d518
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://vivaldiskibus.com/FileData/ckfinder/files/20210722_C35275394DE7FD2F.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ce3da2f564d3e2b176a9ce636bf6bb61/newila.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/jebujisaruterudi.pdfIn PDF document text
    • https://ovalpolycoats.com/media/wozubetezasatonujugutor.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b756380e8---jimimilakejemadovaweb.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/567a8b02e4a876e3315cad88ab2d3723/32592742459.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/runotejafugejitoxusubifo.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/86623257195.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/770d73uvmr1ckacn9nkdftdvm0/37522181731.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/44a44a2438090f84f058bf962f7fe832/pefevupipalubigefu.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/5778686165.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/manuvujepixax.pdfIn PDF document text
    • http://islandpointfl.com/userimages/82935426239.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/95423610281.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/25337929274.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/97642187923.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/69f3f78a70b65072dcfe60bb7f873cc8/jokavomekixav.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/99021587450.pdfIn PDF document text
    • http://artside.org/data/temp/file/79097295111.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8e8116d62bbf3cf73905ecee44206632/7643459395.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wikuxiduxigiji.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dea84c7ae---96709624730.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b842fad412---zajobusodijenokezutazad.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/45469365023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=5+ejemplos+de+enlaces+ionicos+con+estructura+de+lewisPDF 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_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 11028 bytes
SHA-256: 86d879fb7ce4ee277b969578dd8faaf338e92c98f6d1c8a813bf2e13d6c70eaa
font_02_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 18624 bytes
SHA-256: b47d528b3d279f0fa78c5661e55b709efae775c9530019695dde96c19f0387a1

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