Malicious PDF — malware analysis report

Static analysis result for SHA-256 a451ba9c97faab24…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 05:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89d651abd4bb2c2c134ce1859fd78684 SHA-1: d83e5eb93fca661cb494551a19dafe9d1244381a SHA-256: a451ba9c97faab2436a217ed4056e5b0cb81ba509b7f46efd524cde9f31168ac
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and links to multiple compromised websites, indicating an attempt to host malicious content. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa1565460c---30935122274.pdf In PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/nedat.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/robelikalutenijisofojijoj.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6f39a77---godafafoxikero.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/24400964479.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/fegunitagavezuguzarevomo.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lusifikodedujolaz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35c5c41360bf555a84a4ca1004c162c5/zagokexez.pdfIn PDF document text
    • https://coevent.ru/upload/files/dozoxipukisilewedugated.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/81080960992.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/16240623735.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/senovavelovilarij.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130f58cc6b7c---xirubedejipigibi.pdfIn PDF document text
    • http://recrute.fr/files/files/66485280683.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/22659409554.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fanozedosadurunaronesaw.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/23642480165.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/xaxuxajuzobazivizelupav.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/konozixusubazi.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/55909028136.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dipigak.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/todozitil.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/15351582920.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/kagavonenipilolozukiza.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pegowar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=igi+2+covert+strike+download+for+androidPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 17704 bytes
SHA-256: fd6c5d9781823a69229e6ac2097b99438683f1228fe0da41e9ac026141625386
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10968 bytes
SHA-256: cdb1419a2dae6b1be44c8e12d7ca071e8b41e29c6a6320834e9f2a26ae7c663a