Malicious PDF — malware analysis report

Static analysis result for SHA-256 95056b0e4ebe491d…

MALICIOUS

PDF

91.3 KB Created: 2021-08-04 22:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d201d443fefccc5cf49affa699e17e9 SHA-1: c81d07d51dc49bf67ea0f8ced1135a25a999ccb7 SHA-256: 95056b0e4ebe491dd66e7e981e984d0475b5541c8db82fe6dddb5daaf4998e00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=how+often+is+the+nys+court+officer+exam+given PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/aec957a51f1e36d501529677d8f682e0/dobaxupupudoxigolovile.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/7744312185.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/65f06006a5a46417a6c798f9f5d8c13d/kezesogevolabad.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/2136685678.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/efa60310a95a95294509913d254ad502/1423540466.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/rugawizaxavizexupiwidor.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fcdd619da---18356979884.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bozajaxoroku.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/39850772703.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2bb7126f3---misigufirapavozalado.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6e339f1bea5b77160ca7e83410964a19/zamovuveledejobofaginuxiv.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7438567f---50149739197.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/81206899262.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/57467360018.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/75208144639.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0ebad154---gasepa.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/2228db38bfa1a185b0526c32a82f59de/lebomajetumutokipevigek.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/detanilebaporiwug.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609faea12c341---lipufuriguf.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/451d71615581329664b35a9ae89b46b2/kulokutarufuxofusevuxe.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/mejozijidevosowifunojebez.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078cbd50ea30---98090173173.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b74314ae---ragujozofuwetalasude.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_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 17944 bytes
SHA-256: 12ea80bba7e0858417a2894adcaa40436df2ddff06b6a4b4ae0bd257ab6bbc49
font_02_sfnt_off000143c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C4 11196 bytes
SHA-256: 1fe7537d58f082cd49c66f30442719219c6e3622e053476089970416d2108ea8