Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d3ca816628ad8f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 08:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59ec1e89078af86cc658d58095c19cf9 SHA-1: 1c310b039b7d4565f45b20c7236c19d54a5f6c7c SHA-256: 41d3ca816628ad8fe729277be8c989fabcccf902ef0a2d2487613e7b76df6787
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious URLs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2viur0e1khe0nucjlh0d58vibb/pezuvigudedufuwevowo.pdf In PDF document text
    • http://zatacorp.com/upload/files/3983111224.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kb9o1fou61ks8trgqmlln358em/30614946823.pdfIn PDF document text
    • http://rs-entp.com/upload/file/87120909729.pdfIn PDF document text
    • http://sunfitclub.ru/app/webroot/js/ckfinder/userfiles/files/vegopuvepizoguti.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/tokurigojesodewala.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/jutomokeletovelegesezob.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/005743ae4bd497949e2e7a52fa398407/vipukepisu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/v50j805bpsp17aftt6ndtmemk7/86407810001.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mavemusebogipe.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a63fb3f1f---46590062923.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16070be2bb81ab---47469407213.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/duwivewitamo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/17100462644.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/ruraxadexazopamorerux.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2aa2092fe0b95ee74bfa4534cb4d8094/82709385268.pdfIn PDF document text
    • http://santabruna.cl/upload/file/maruzojowoxenebu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2de10b60c---zanijikax.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/90940308149.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098920a10084---neket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=righteous+tap+housePDF 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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16756 bytes
SHA-256: c66615967320d52da9ab1e321efadc804f2cb4b95e71d2684255fc7b714b5aaf
font_02_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10424 bytes
SHA-256: 506ea9d36a5acd8408ed59e83062ca5233011125ce74c19f5cdcff0e8b21d1c0

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