Malicious PDF — malware analysis report

Static analysis result for SHA-256 2085d602e8533438…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 16:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06f50259745b6901c9e51f5db07991ee SHA-1: 924377938eb26840dbd6ba1e693ebb59fe7adff6 SHA-256: 2085d602e8533438fb28e80d5cfe563b455b57685d513e8f5c27e2eb2cff2a98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://crysiq.ru/uplcv?utm_term=cep+taquara+rs+pdf PDF link annotation
    • http://georgewongdesign.com/gwd/upload/files/sojonolefu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/70001754057.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51794ee2de---divuzuv.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fc3e7e37b42755519fae562081d0ded5/masotaze.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f5f009366cdf6dc606de3b29fc3fb53/mifisip.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vijefakojoxetojenig.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/3911214513.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59f8da12c---54508635664.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/lawerelepabowewosuxen.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/29350233604.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/53980142242.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/46999079354.pdfIn PDF document text
    • https://onecre.com/images/content/files/10640055630.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160970f1c5ace6---58242598171.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba02c60f34---30251911232.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mafotubuxatesu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2520974448b6f82e6f1f2b3d23a7428c/pewiwatuvajoxobumiwevez.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/58605749457.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/pavobirojotumivi.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/90koqu291h8me3hofu143h1qsh/73530607138.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/xunane.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/penemadu.pdfIn PDF document text
    • 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_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10404 bytes
SHA-256: 21d9d364c19bcea37dc9ac711f608abf39644b5e37b72832dee8e52665bde933
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 20024 bytes
SHA-256: b3923aefc3bac7a23feb5148e22f3467f063bc3c3901b625ac7068c9a5e4cdc5

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