Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a0d8b4913dff9a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 517eab104241958d0ac5c0442869eac9 SHA-1: 8ec1ea489cb2733a0396350635ccbfe6e202d4a5 SHA-256: b4a0d8b4913dff9a0606e2e4b70b2afca695f66c4384f7326c15e5fa28f56d03
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, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/81483082026.pdf In PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/71907379825.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/86026693943.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/dukunirepoleminam.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2afef6d5---55485708059.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jowojomabelesuwivota.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zasojulozenoguj.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e7a3a074---90337636636.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/viwexesufofa.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/dunonajotekefubuxo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3bdbed4e---24350440157.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf644aeda---39200163202.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xerefirisufun.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fuvowol.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogiv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0a83b6dd---26247347890.pdfIn PDF document text
    • https://aneri12.eu/res/file/xagagurasedonaluvusew.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/65795389657.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/80364196404.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/gosunerobukaxobodemuzas.pdfIn PDF document text
    • https://epiphanych.com/images/file/81889715045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=conversion+metric+to+metric+worksheetsPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/teziwip.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 18488 bytes
SHA-256: 99c8dabc254723c24a0a757c349a5d7da9aedc49ecd4674801eb0bffba403b3d
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10564 bytes
SHA-256: 45584373909d58867a089e79c308c1865f507556237ec7cf9f53b37677fd5e5b
font_02_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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