Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f659059e04f3b4c…

MALICIOUS

PDF

147.6 KB Created: 2021-06-29 18:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 97629782a2c1fd696fceb6974b1284ee SHA-1: 4adc1f8bc038ba9344b5c2820e5b74d68baae9fd SHA-256: 3f659059e04f3b4c7db479896f06110175f30946b66008e3fa5736d9603e143a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n0edhavre4jo6h4evqd80ad1f6/41210301233.pdf In PDF document text
    • http://praguetransfer.com/files/file/jepexuzobenuxobati.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a86c91c75---65031138396.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8e12b45cba17a47d1e43c9b363299a02/34741071086.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd6e97455---jusufinefodopagej.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e39fea0c7---rudadozotowalixuba.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da52cc0a88a---resarezagipi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dd712bb---faxelalu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5632a55d85---bimaxu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb63efdfd---71427382843.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xibanalirekepa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1c67gcoonnfblk8eftpd10s4j4/vurem.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/10941647843.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062302503973499.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/43njcme5sposckma5o68ngui76/fimikoxi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fp6558ii86k7141f5efoh4vj11/reruka.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c8f6738f---jozegidonitelenobenojuvar.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26089680433.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6bdb310c8cde6554d2c8da4e132ebfa3/fefegomasulizir.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3400d4518967b56c894374757e55b7f7/59662706309.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cf55d7e7---31608329677.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/voroladekugarukutedokam.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cdc3a8a4---fufedibupatufepidesuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+6+purposes+of+the+constitution+in+the+preamblePDF 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_off0001df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF4B 18052 bytes
SHA-256: 388d0f924e16daf7827369eb63b5c06863a7f915c2c7513a3259301ed9991446
font_01_sfnt_off00020e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22693 11148 bytes
SHA-256: b58d4043e71b98b77ceec3ecb0fae4fcd8ad1da1ec937ae37526486d6fb977ad