Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544eb22025bf6c7…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58e9e3b3c87070a5441f631b567f4669 SHA-1: fbf77a506e53e43b1fa9ae871ff6984cd2efffb0 SHA-256: b544eb22025bf6c7e7d85638ecff9e7cb26653b2a272eb1515e592b72e0e44c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common tactic to distribute malware or phish for credentials. The presence of embedded JavaScript suggests potential for further malicious actions beyond simply hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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.
  • 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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c78e33080---49606843402.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd7cdc78---koxokujelowejivojosago.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/34015738255.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/48959722436.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7bfb3ac980778bc5907800fd0aae2b53/bosegotepebukutosinike.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b21789cd---dixikurilugus.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/zosigino.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b6a6e242a12ec9d852b996a422efa5bf/nuvujetoguwe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/34484891153.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/384e8f1e20341f397098bc6d8cde8fe3/dixud.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/60461209933.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/73ac0ce2dd2cb41290aa34d980939293/gomoluluxasaxogixorozagot.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/talivuwewoxoforinubev.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/temeponimuluwigozufilakol.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/widatabofuvabafidura.pdfIn PDF document text
    • http://short-story.ru/upload/file/41201894523.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c75e153f8---zaxaruja.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/02f1d452c4e3dbc2d1f72ad45f1790fa/kadezudagetalasi.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/13231922686.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60863653743.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/99193239681.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b491de18ec1---mokotoxugi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jf7s4esp3r6u39g209rd74ftus/kugaxipemafijonemew.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/debotawenixikufemesal.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/48694411757.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/82de7c7805af63503f3f7cef4044875b/fejedikerazujofatagaram.pdfIn PDF document text
    • http://adveotec.com/img/file/kunuxoriwevesodovu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/udofime5o1pfthjmv0iofvv8b6/pusijeganasavenepipaxonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plant+adaptations+for+kids-worksheetsPDF 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_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 10808 bytes
SHA-256: 61eaf12f731d124e077388851f9a84077492fa5c3bdab50a37e6a8dd966b5382
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 20028 bytes
SHA-256: 97c084af9338cbf2d6a02916615a167534e14dbd2d8949a9711ad2b1b13f947b

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