Malicious PDF — malware analysis report

Static analysis result for SHA-256 638897e45e17b499…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 05:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59e02db2488f636274bda8cfe4f6c919 SHA-1: 1793c93e258fadd006a68adcaf846d58609b197b SHA-256: 638897e45e17b499909b743fe26c6b43c6847268219ec36be8543172d2296e1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to potentially malicious PDF files hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farms on disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45674ec30a---47570807204.pdf In PDF document text
    • https://koncnc.com/genelresimler/file/zalumoxuminuz.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/99449067363.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gosozibajikofezelewegomek.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/memofizuwogafowelak.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/4762223731.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a3fe3e23---gutale.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/geloduxovixikekisam.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d287fd3a9fa---27262388851.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad7113cee---lirukimuvonokus.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/16065813209.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mixoborex.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba355da06---zurotesewawisirevozeso.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f49882ec60dfb48ebb0937c6c51ebcf1/wekerikex.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/22161467793.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be828aa3498cabf3561ab7d6c8929e74/vilek.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/73703584361.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/tigegamiwuxuvukafokedezu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfd740266---54838827251.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/vajipigasekuvepotixo.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83872075464.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/ximafedetebefowufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=prostatectomia+indicaciones+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10736 bytes
SHA-256: cf1065051d051bf13a5810ae5e4f79a4643bbb1f9146fbb7fd2db698481187fc
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 17952 bytes
SHA-256: 1ca4ccbfdba9f29f33881a6d93c72367be929ebb7b2c4f1d0b6e69267e4ddbc0
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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