Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ff8bf8a792a51…

MALICIOUS

PDF

94.0 KB Created: 2021-09-02 08:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83b3285791d328029a3ea42576cf0662 SHA-1: 9c37d67ada8eb25bc76c703061930c1fe5da6d93 SHA-256: bc7ff8bf8a792a51698c3f68f694a3737be2038e8822720116cc15ffc2534aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sbsinternationalschool.org/sbsisnew/userfiles/file/33718919457.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d327b750e28---nuputojogan.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/8917268167.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cded4fe46f9---fowigu.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/lirazu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4667a408---62881601547.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jogot.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/76f0bb2d424621220972c23bcb10726f/musudadixefabujefebuw.pdfIn PDF document text
    • http://travellerisland.com/files/22543102508.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/g5kmjbmvkol88a3vsrun242kcs/lukewazen.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/8725194720.pdfIn PDF document text
    • https://italvaping.com/file/52211714035.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d266e56bf---46852093778.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/6152805347.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966900a4b51---kesavakasesogodepas.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02afbc48c9---20349067071.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nililagitubonomiluxe.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/dedetowobof.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072523073073499.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/gemibazelerelivutan.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/2424176597.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/31611448098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=legal+age+to+drive+in+texasPDF 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_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 18208 bytes
SHA-256: 7841c23b7223885080f5e8ce24c09e70e4893fff4c74fd7242168e071d2b7a54
font_02_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 10548 bytes
SHA-256: b25b9a865ca485259bf9f08da06feefc4aa0e2ad67468ffad8059ef630c33f5d

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