Malicious PDF — malware analysis report

Static analysis result for SHA-256 521e548e6edaedb3…

MALICIOUS

PDF

78.1 KB Created: 2021-08-19 01:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3425ba3e6a1929e16e5b769037b27d3d SHA-1: 8d00f76eefb1d4228896210f568142f5f3fafb75 SHA-256: 521e548e6edaedb3bef3c1a27de9970042f9c8ba9eeb542301e115439cf0fa78
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a31376c93bb---kopafebarul.pdf In PDF document text
    • https://tahubunting1.com/contents//files/13078147737.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a73181aa---39353132843.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/72aaa3f7bd837e57fb545598ab5f4483/40190058638.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/27b6b67daf6a4000ca3ae93afb4f3755/22799240566.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/82209410464.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b296818fff---mawenunugawusebilowuvatu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb328216e2b---44552033883.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/fokomepawerufufid.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2e9223c5---13855773926.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1142edf5c---47309429045.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/77548712293.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/1584967428.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kapaku.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0228c8a36---27341017163.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5d9ea08e---63865513074.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/kurakimuvebekufudawilubam.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/93866908928.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gazivo.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210728_1C52192157C80F62.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ede04b80---55164668545.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/82969328885.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/sazogewadenanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=similar+triangle+worksheet+answer+keyPDF 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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 17112 bytes
SHA-256: c2b7fb206d621515282c7736339186becf155b88e130b4e84a5eaefc5d357b87
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10924 bytes
SHA-256: c6613fb1a522dc646c102060ab9b029748e064ade9e7305e5e6115ac11dffb18

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