Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9ec2774eff279b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 19:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 770e6cb70ef1c0d4a08ade344ef8ab62 SHA-1: 91d4db852bd9a1f10b55904f98222229e7a0c346 SHA-256: cc9ec2774eff279bf2d9d82a0d2d3ba3f37118d34b21dbf6672d2714cee7fa76
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3202a5ac0bca23de0b684e5461f529e/6256517739.pdf In PDF document text
    • http://suphammamnon.org/uploads/files/pejomeduw.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9fc6303857cf75b8ad3ab44bfea31d8c/guveboleso.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxetiwobibimadejexozisaw.pdfIn PDF document text
    • https://okazionche.com/files/mawivediza.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39326d23f---21423953718.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/14956589043.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/32951799966.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/binigo.pdfIn PDF document text
    • http://gtshotel.it/images/file/duberufijuwukop.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb921756f---jajarolapiwuvuzem.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1024dd147c---67982223307.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0a5a634222dd9fd7a11594e8d4f5f9c8/72251624937.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/41212402905.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/xatubenelusovem.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/42025410816.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e18bbcf25---3484714452.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/75427105387.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/47111215115.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misibibo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/krtj2babgpidmau7rsd7sufd51/14272881321.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/nebogazuvevunesomegubimo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4e65a63486dff24d2224049cf32e1b1a/nepegigobonisegag.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hb58qha4166jo5jm5etp0jtic1/9990235096.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/gejibate.pdfIn PDF document text
    • https://blugarden.eu/file/guwetirajaxuje.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/43744451707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=converter+from+pdf+to+microsoft+word+free+downloadPDF 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_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 18100 bytes
SHA-256: 5d32ae1738cb0ff65a2dea5402ef4c8ad7b578a0d18b58d2848b47153bca761f
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10964 bytes
SHA-256: f0821bc8c767d6a08e376790f915c4e85a5042f50bbb56d04343c5cd889b2994
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1