Malicious PDF — malware analysis report

Static analysis result for SHA-256 132697c016c10159…

MALICIOUS

PDF

96.0 KB Created: 2021-08-14 07:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9d794fd8e338c56e0d5824e97f74e899 SHA-1: 81caafddfa86371ffaaa7879467796d3af511a0c SHA-256: 132697c016c10159ab7a34a5e76dd7f7a84b276b2d9d33f7e27d316810d0897a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=gnomeo+and+juliet+worksheet PDF link annotation
    • http://radissonhoteltraining.com/userfiles/file/japiragigalexedidalojota.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1001c619610e977392ee1631eb9b23ce/5376284480.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae056958---bukiv.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/xeboxifapavawotesomipuliz.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/79845596e6dd2ee93ebde0e7b178555b/tumatemarowanopolidoki.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/94136943597.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/08a72145a796164f12622dda1077e118/52476328958.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/81080686410.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/xuditito.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nimowureda.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/90713507843.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/rovupigibobaditula.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091c289bc490---mofino.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84bda14a8---68372523817.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/tirunitelesatiladogon.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/72115923256.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ff352802---78710319633.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/mupinefas.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b484a719---74325871010.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/sezerisufolude.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zojuforabolafadukuberewam.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/21494927320.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16956 bytes
SHA-256: 194fe3f3db042cac7177e365f6ce55eb91a849d0d05b4aeaaf9f9af0011d5a0a
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 10960 bytes
SHA-256: 6ed298eb49eb208b82c3b593f4d196b2221997d08cf8dc3089d95d4e1c602163
font_03_sfnt_off00013f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8F 18616 bytes
SHA-256: 895aad0113795d5e3059274fa86b014e24e6a2081b0c5905defa86ece64cb0f4

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