Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c91dcb3a233723…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecddf3c642763b7da741a02344dcf05b SHA-1: 3c10411447f2cfe4435d50b9b3419c09ff49f31d SHA-256: d4c91dcb3a233723579a763515dea8f94a2d298d6191c0de4c1884ef3b42f49c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting, indicative of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm on potentially compromised CMS upload storage further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=icse+class+4+maths+book+pdf+free PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/vamuvuxoxofubiwigub.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/45609873488.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xupus.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/jebixuwilemibivujavika.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofosumokuzadikiretirenov.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2057b4de---85963646385.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/87912270244.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/77044749888.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/14500224136.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/parekutodebiwotajukonis.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vekuxuxatodusesu.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/batosefofefasep.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6f29f844c47f4f8c57d58194972fdc7a/segisalojirefum.pdfIn PDF document text
    • http://thecuriosityshot.com/kubat.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/vopuvopewekepovu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144c00c0ae5f---ditepajamukemoniradazewe.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/10027880233.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/31671947931.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/wefigigudurikajeju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358181e0b69.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mazuxegefatejuvovarile.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f9cd5f60b91ad025e202786faebb7934/bazazudanikuv.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/1674890669.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/riluk.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d1dcc817c856a84288d3d04a9f42e82c/murokugibepilapetu.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vemofag.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_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 10948 bytes
SHA-256: 44d84b0afaf53c0e6498ad36a767994f5d1fb5aeb76473599c560163695678cd
font_02_sfnt_off0001407e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407E 19168 bytes
SHA-256: b050f4d0d29f01c7e25c9aea8706d7b504c30dd7d14125c41417130f26ecc12a

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