Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0b663bc04fbcd4…

MALICIOUS

PDF

107.5 KB Created: 2021-09-08 11:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef9796327207e9b66e0f82555914bde0 SHA-1: 239cb9211aa0c917bd276dc806b2afab9c9ea876 SHA-256: 5b0b663bc04fbcd4c5f54b2451fb5c216eb75c7d5d97c9c6f802a77ef9915dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to these external links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff42f2f13---89988407670.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/jalekofulagavupelodasan.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/26be9bbf091204ff41501255524b281a/77785581094.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/2425642274.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/78966807894.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/19037590859.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e6eea5e138f9c56f6cf5aeb664ab112b/dunitojowoz.pdfIn PDF document text
    • http://qzgj.cn/upload/file/mubavibule.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nfmp63osmd6gdiljbiknev48oe/37358975572.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/winoribuwox.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/78367882640.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210908_028316BC16D20614.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0cca0851---82909033363.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/61461479324.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613212c18a1ac---vogotuniwolefikubopux.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9jshbt99o1g42kamalq0ja98ih/tujilevolasefetonepa.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/gawiweponerebugigut.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/nipolilozexofafe.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/0932b9296667870d3f9a30654d9e6e5c/sazewaruwekenivenozuvaf.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xijitiwizo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b25bcd5f54d---mofelijelamopazifaluxitag.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/javaxa.pdfIn PDF document text
    • http://patroha.hu/file/vovukekadowonavofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sedimentary+structures+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 10904 bytes
SHA-256: e1cc7b2a118f9a5ee0a9484f03b2c06068ac9c2457aa44e2f3e17c94fcde1f44
font_01_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 18416 bytes
SHA-256: 96bc6a2fa4a23e54f6270b0a1e8c20950ccf414dd8ccdc5de16aaade4bd059b2
font_02_sfnt_off00015823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15823 18156 bytes
SHA-256: 0167a8043f2631c1a0b06e2d7be8332bbadfa17fc36d2e07e3637c43e397dbcd
font_03_sfnt_off000187a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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