Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0ebcb27fa389bb…

MALICIOUS

PDF

87.7 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: 5e3caaac2bd6f3750e758d3c58e4a321 SHA-1: 925fe6b694c74fe26d6a3910d349d6796a4ba416 SHA-256: 3f0ebcb27fa389bb5753ebe2880f1654db962bd5a8c8e4d88b22b26ec0579979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://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://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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

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
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 15688 bytes
SHA-256: 73b827d6d290520ccf55390b8be0cef9a30e3bf2ac45fddb16226c1adf2a25c9
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 10856 bytes
SHA-256: 15b4f76099638724c7e42338715cac6f3860e13a63ddd5f78d86b30ec55213fd

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