Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6ab47659917501…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef2ee1643cf079e2bee830349af7584 SHA-1: dcef0eaf16dcfadfa64ebbeda760de778c77abff SHA-256: 8d6ab47659917501be4a488f93f260f9b58a630f1b6bfb825aa0ec74f367a0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam related to 'free Robux'. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sassanoproperties.com/FCKeditor/file/wojitusemawupedimuwepo.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vixiseke.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/71901388590.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/vuwitozevisazunenasutu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/17125885362.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/vaboz.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/80142009138.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d17e2085f4fb0f0ec788a8990ec6bc0b/bokovinuloraberobura.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/natetenetedexovugi.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/64743710994.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/10258477579.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/99595002080.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/1647653060.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/bapefafeponafobe.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/kojuvumemepawafiwirujo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/43796610830.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edff1864b0---55712080432.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/63458703040.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba3611d6b---xonigo.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/wirixeda.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a6968ea4b029145a962f63078a6799d9/60092409483.pdfIn PDF document text
    • https://grnca.org/img/files/files/pelapirikuvofemodisuwise.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66423336187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rbxloop+free+robuxPDF 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_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 10116 bytes
SHA-256: e38d681bf1569a051de139b12a6151e58686492cf2c25c1e50d6c56f9ae616d8
font_01_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 16032 bytes
SHA-256: 6285d893971cbae877bdd84a96ae747a47abc9aa275a8447ec58bed46b4d3448
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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