Malicious PDF — malware analysis report

Static analysis result for SHA-256 09633472f36db102…

MALICIOUS

PDF

103.5 KB Created: 2021-06-27 14:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 17ce4d705060b1697a9d69d3db5cbb21 SHA-1: 1c0386b44d6695bc3d7f3b978a1dd14a6a92516f SHA-256: 09633472f36db1024a64f49abe6ca93e0161f2bf710ffdfc7dd36f25bb23d4fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=subsistence+farming+and+intensive+farming PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e1c8biirho5hpc2aj12sfcujd7/55029760988.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/71344087848.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9c19d100---ranowezamem.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0bb47d3f---29076347496.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g1et3r0v8bd7l2p7rrho61osh5/1765972281.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/bozizotepovigal.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/modud.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073045f0e04b---95342316569.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca4030edf---1229324603.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/xiboles.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f654ab3ae7287227bd995c8737eab24a/sikabufuvuguxevepazesi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/43849501137.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e357df1696a699c47aaa17c989fdc50f/suneginepejanepufepiluso.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcd2af400---demabedufuvobagepuveren.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160728904a6a64---67355157724.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e243260f8---88245907844.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4c398cd6---fuwerowibika.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e0d11503---natejinakitazuwamib.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muwexaledozizadima.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9557f6549a---vawezusudetojug.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/1e205af5b89a637be1f49e156c3022b4/33124603100.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b094458090c---81230881781.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5789cb79ed---36936625818.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_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 11036 bytes
SHA-256: 10d765089b2c1bf9e1b812c76547ff2e3afe63d6f9230c9596abfe69ef48b68d
font_01_sfnt_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 17896 bytes
SHA-256: f43f1112945a3d92e3101e469683ebcaa506c5597855e8bf18213bb06a97cf1e
font_02_sfnt_off0001787d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1787D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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