Malicious PDF — malware analysis report

Static analysis result for SHA-256 202c8372a3a5786d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 08:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6603e343e4770f94ddd6c79d3d6f7eb7 SHA-1: 5e6331f51809f8ed67f086f2ec84cfdda851737f SHA-256: 202c8372a3a5786d5759d984490b162f49595d605c4b8d9ae30f3f191707c811
156 Risk Score

Malware Insights

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

The sample was detected as a PDF phishing trojan by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating it functions as a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e826fc0431---kowibupixoli.pdf In PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/52219636712.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/dutinul.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/39713955661.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nigulosilawugalunegefoxij.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/37114267454.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430141032880075.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/49736922a8a6575e83feca2dad15872d/dafoxaxijavaseduzapawed.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/753fff6e1847fb5d36fee083475dac15/58672364122.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/665118e9b2b96d9147208b1939d70e1c/45987384753.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/10371402940.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210808000002_0m5jgt.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/dalexuz.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/47019205472.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/xinimaxeb.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be078db65b4---pisosukefiwinapexa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/285f6873d6a2fd868a01c6091d5219ab/ririvuroduvifizo.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sj95vhv1lpqhjv0a7s958c7scs/dimewobikaxiwi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/npv43f0lu12k33i695v8t7mumo/dovijotu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/fekagutumivatatige.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e286e75a62818375c7c2bf8648b3342c/nezurexukudigipuzipuzo.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/27534304890.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dd7b1a36---44541215972.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ede976fe---mimiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=extraction+of+metals+questions+and+answers+pdfPDF 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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 17088 bytes
SHA-256: f4cd5e31e47a0dab600ec85ced812ffbf3c607f36e5029e64bbf2b63cb9de870
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 11196 bytes
SHA-256: 39239cae24bd27744be205cb8d6699e0058457e73306c83c3333a34718c40111
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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