Malicious PDF — malware analysis report

Static analysis result for SHA-256 2308ef1f4b4d237d…

MALICIOUS

PDF

73.8 KB Created: 2021-06-12 18:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cee4d40650d08257676115bcb0d8c3d6 SHA-1: 48d2ac9fc8eabbd8e51b0c19e7a7c928f0415e76 SHA-256: 2308ef1f4b4d237d9104d72d270f00ff751e114eb5a998b9ff0fccc88be5b43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to wealth or rankings, likely to trick users into clicking malicious links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a critical ClamAV detection, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://coretry.ru/uplcv?utm_term=who+is+the+richest+in+the+world+2021 PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f42df9db8223b0f40d477f32c7ecefef/lufok.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160983f375aa4c---1965116921.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4cd08bb7fa824b5152b77371d0bd8b1/xotabopamaxa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35f1f047bff6eb2a3e31ea6d0565a10/39936811789.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f41c07943---65780011796.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2633ef023c6939dda49d2562c72ba595/mugujopaduluxiw.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/judutifutalose.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef01875d30---nigetoburogipub.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/ruzogurovebikapulisus.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea564a5b8---83164994832.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8bd787125b54ecb0f2006022a18a4430/39440944411.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/32820240512.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/mexevomepemamopumodatizu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6e98d57b69f2d642ae12eb4a511c3def/zebotaxaleb.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6d0803b1cc7c8e7d48ebc36b7de152c9/61356348356.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/34rhucc8ss415urrqidbvhbclv/nagolijofujosinomoza.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf798aa18---11497712938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5248 bytes
SHA-256: e2eafa339fc315bb70a26964b40b184b3eeaf400436ae603843fec7881701438
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10632 bytes
SHA-256: e391172f120c91f0d37e7bac3c1d89d12f0106c87dc623789741243dccdf6f05

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