Malicious PDF — malware analysis report

Static analysis result for SHA-256 388d222a53c56ee4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 03:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7a6414bca329cb98eddba2429e04d5a SHA-1: dd4067348b93e2de22d5bbcba0d4bbbd88c3d321 SHA-256: 388d222a53c56ee472fefadfe70deb569b5634a2834430c04db5ab2eff70942a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cppzone.ru/users/blogs/file/nowanawelagadojugimorika.pdf In PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/28366547030.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/paxepunoguzunatod.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/fusuzevofaxelami.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da97dab3---73964861082.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jagofozeradejadebije.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a300c73118---suletubetadusexofosafe.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ee10edea5ae42a0008fd6c0281ee0356/95592157077.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/49116357821.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/30062719038.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/pinorubusuzatedizulagezob.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/durubiwujisovalaragototam.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210910033535.pdfIn PDF document text
    • http://vtaky.sk/media/file/69376282128.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/rawakogogo.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/pibitezipajesukigeludosos.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/26783769198.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4a825c62abbdc906cc0f331d9c063880/34742755923.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/50073999494.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tefabema.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/subiratejusotudinufadufuj.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/48793385671.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e975870e---suzigilalekoxala.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/mokoxolijetomoloxikusiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tv+pato+2+apk+2020+downloadPDF 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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 10340 bytes
SHA-256: 1a21e91de40ad2b89db84688f8b94b02904a4774944343095514e95a1d4be825
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 18216 bytes
SHA-256: c3c8a4203546139a544d8fd32408148714412f7592d4a596739af314cf44090a
font_02_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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