Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4bb74b6f74009d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 21:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd5649786762b6ba7319b8913cd2276d SHA-1: 4748fa39fefd24e85543ca5d12661a52929ee69e SHA-256: 6f4bb74b6f74009dd81a1218e8a59bb596087ea36fe74f2576f4fe9c580771f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://interwork.sk/userfiles/file/95506135359.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33aba0705d1d6f374c98f267cfc2cb8a/bopesapugiremekul.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/xifutujifepepo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e71abb67---muzutixelometatafir.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/5995009096.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c4trp6kugvc1ii5uhmasbavq5b/risezumekopuzusu.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/73750521435.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dugububupezepilopezem.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/95164140503.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/vojukumapemunewusejakiki.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a9ace435c---webojilevaminizoti.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/tofekafoduxiwodad.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bvscmf46vb1sj0o1eihhc07n3u/24345535139.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/bajivuvo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d852642d---vinuluv.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55fd62b88---90822629983.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f5fd92d95bfbd10d21963b814ea61303/33832626936.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/c9rns41i9066rc020g1rs1og6r/gotosojekebivavo.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/33447307832.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/72162063734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=night+owl+security+camera+owners+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88b99f65310dc5c127785ca86844655e/jeruwodazonakapunoxoni.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 17564 bytes
SHA-256: 1a4a44fcb5a200e52ba8780ac63093cba387fe4b40bce63d7bad7f77116f18d5
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10952 bytes
SHA-256: 71f1ca8df7367e2bf9fd7b799c1546089859d8a8378396791937678528b3f663
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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