Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8c88413ee10b8a…

MALICIOUS

PDF

63.5 KB Created: 2021-06-24 00:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 63c6fe35b41e114e5c84bc67f1450b8b SHA-1: bd0d2ad7d424066b8ddd08e6f7d571b992205d5f SHA-256: 1c8c88413ee10b8a37b610837b3cc441718ba65f08a6187b1e4f8d83765d49db
154 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 websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The primary attack pattern involves exploiting user trust through a seemingly innocuous document to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

Heuristics 5

  • 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
  • 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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfaec5209e---sowusudovo.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/hh8bbpc8695i8sqc7ko7rh5eh1/wumiduzilaxomefedowaxuni.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/96845976139.pdfIn PDF document text
    • https://samowar.ch/upload/file/gofixumefi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/39008961890.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/48923459852.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/msnr4u5uj2j6j4ll5nfpdq7381/nabivoxobutapefejiwam.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/41829516405.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d21feb1727a---23872407753.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/367a9939cdf8946bb2a017e5314bef5a/56215564071.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/bifiseloni.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/50c4e0fada9a5ebab80c25e0928e7181/tunekowesofunexuw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde863cc48---9701173457.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d948d0982---nepopezezurigakoseduze.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/basobojifezesozig.pdfIn PDF document text
    • https://actor-conseil.com/files/file/38792622094.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xifaruzovoxujabujegek.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/84181725056.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4f0867b6---55649802779.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/79699428005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=anandamela+pujabarshiki+1427+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5904 bytes
SHA-256: c35ec222a82f3604100ee87e9ea669926a4b0ee1427152805fb12cc15fb4aed3

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