Malicious PDF — malware analysis report

Static analysis result for SHA-256 264cce0bca32f30f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 00:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 097aa56d32e2a55ac9bbde06271ce379 SHA-1: c2391ae7eb446f96dc4f2cedad8175854ce858cb SHA-256: 264cce0bca32f30fbfab9f9bee28343becfacc1adf90d0db87527fd00a5bc16b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l6191mjjbd8modmv8vil1n8mj1/99317900753.pdf In PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/25967465316.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/pixiwuvedolo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rflignvq4a9sf956ilm9qhs41e/76323699000.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/miriwubowux.pdfIn PDF document text
    • https://istanajp.com/contents/files/38430653656.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/puxebivug.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f653d7d18a---valanoja.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/26899121570.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/61594670251.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210907_223837.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8c6a116e502da035d0e4963bb103a453/17310974631.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/didoleba.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/robudimiduvawufaw.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/21958194238.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/xokusuworipoveguvitu.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/53240623729.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d4e3d2bf---94147804730.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/80347907892.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/11535325297.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/20259985617.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/16554571946.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/18331449353.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/feborosavewexipizanelas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+1+com+hill+racingPDF 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 17624 bytes
SHA-256: 85e16c7c5456443c360e2422910d49356f3d9ada6795d19440a02411415ab03f
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 10452 bytes
SHA-256: 0dac737f1c53b591504692ec8774c1cd9d74234dc00be74c689fc1fc8479f01c