Malicious PDF — malware analysis report

Static analysis result for SHA-256 56077516d51f1997…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 03:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f76fa860826f79518da3fd825c3c8df SHA-1: 59a8d58a9501e39bd6b8a727c3c311436542269d SHA-256: 56077516d51f19972ee81b29becadcf43397867a058a76a03947a927fddd9365
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute or host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161402c9a3c196---68725783998.pdf In PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/paroz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/kofosibezidaxumemeg.pdfIn PDF document text
    • http://renknh.com/ckupload/files/ronuxe.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/29175740633.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/84566593713.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/12118685376.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161333a4413d7c---lapodakeviziruwatuked.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dawesiguxitokan.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/31265824045.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/wukesa.pdfIn PDF document text
    • https://diphong.com/uploads/debuxefiminipamijulapax.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140126cacfa5---wegobuwepefalupiwig.pdfIn PDF document text
    • http://unityproductions.com/upload/files/titojomaxidajakugatekaje.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/68788623847.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/botedibemeresujagul.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/futivizukikikez.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/67882950687.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/84270434818.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fenulidikimeluz.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/mavufub.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/80363154250.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0fd892ab---20076774725.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210906_D699B1A932AC9B29.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tyler+perry+house+of+payne+123moviesPDF 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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 16736 bytes
SHA-256: 977e034b2130894f9aafdb6261e67e32c07f52f6e2a3309614990d1dcdb15f81
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11112 bytes
SHA-256: 49dbec8a70041bb46946df66c8809eba989e575e3635674e927068d1beca1fa3
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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