Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7418fa721cc667d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 11:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02bc25765d79e17cc814d256e1353037 SHA-1: 622e3cb58f19f894d56bca611ca290845083576d SHA-256: c7418fa721cc667d22f0b9fc89ae94766b93bd955121767b49520f26effa0e07
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains. The presence of a 'download button' heuristic further suggests a lure to download malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=metin2+on+android PDF link annotation
    • http://usarsenal.it/userfiles/files/wusubusajuzevavugowujo.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/govasopog.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/repifepukovo.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/99014805356.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f3e8c85f---29470174077.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/xajaf.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/44809450912.pdfIn PDF document text
    • http://seamacros.com/upload/file/rixobasugagusikazuzij.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/72278869458.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/69202201548.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/akoap0e486fsopdu2k4c28qsdu/liladufesuguxanibimo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vivegubeguwisa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721c3f06ca---guberegipisinutu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/meseji.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/32961188911.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f5jel154cg978555bvbt80buhp/rebezug.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210905093822409932v24ur.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mujadelole.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/nurogitujexivemapi.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/89647817805.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/gulijilo.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/lobinategapizozarowajuru.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/17123245975.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kabutoxuzazuzaroxebego.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/17548593155.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9832b548f---44111133160.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/wurijosedejeregijagudemon.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dojisefififuzijuwo.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 20132 bytes
SHA-256: 09f18924cd1e78905ee83934047980c5b95cf8a1c565b85c1755edc955c763bd
font_01_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 10140 bytes
SHA-256: a6d68ea3075a795a8ad174162a5abe9148a1aa8c39012ce0b6ec243ffe248955

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