Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909391ddac5228d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 01:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3c4611c5a4045b96ae5784b895957bbb SHA-1: 7c17027f46e352d679717ac495ec4fcc6f7b3afb SHA-256: c909391ddac5228ddafab72a197b402f5643c6a4616dc1c4446108a81d9171d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=analysis+and+interpretation+of+qualitative+data+in+consumer+research+pdf PDF link annotation
    • https://anitt.in/ckfinder/userfiles/files/35349191229.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/zokejozumofiwiwevuge.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5d415dc3e68455cfd9133ffacb80ee66/sepasekopuridawumuvanomu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a060a7c336d---pigerenibisutuno.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cb920ba0a44e2af3d9f531a523cd067a/81749547043.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/sorok.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vasab22nejq15upjfhjfdc68h7/bijasokutovozunoxezepu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/49394586429.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9e02bc54---47533901022.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730c29fcf6---misan.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/numaserodiwokasifiwana.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/mewuv.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/46996646383.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2801d539d---xojugiguwutozamametipaju.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/44854087531.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/baparidabizorusovova.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/775ece582157b20e4a9a328fa41926a4/ronudaxoxezatuzuju.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/nofov.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s6mbo36bt3rjroo1beubdj0f6i/sexafibotag.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae34a8e05ce---wetulunizelabose.pdfIn PDF document text
    • http://stevis.cz/files/file/kidajagawudabudukuburejel.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/rebakezit.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gurulajili.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/52383156880.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17736 bytes
SHA-256: 049b8da5503a5a5844a028902395e12f1e623ffcb92d5e7a9adb9f3f38a3fc52
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 11292 bytes
SHA-256: 0e71004c0af605e01f1c72c512f207edd86507c6f0b91548564aa2b95b1ada40