Malicious PDF — malware analysis report

Static analysis result for SHA-256 3601f3d0ee1c618f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 23:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a97a7e0d21f2ad371fa0fcf93a0c9597 SHA-1: f7ab9fd04b836ee75b649d86fce8ddcdd1d2be01 SHA-256: 3601f3d0ee1c618f5af9f7d93b993ab3d8cc642445848ef646cec2b4b31e7571
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fa95d3d6cf395bd3a0960a8f4ad1129d/migojusuruwuvinuzo.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3d80eefbc25800d8146457b1b228a1a/suwefe.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/gilibevovaxozorutu.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/tizonedoxadufi.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/13275133255.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/16146747653.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/48710037379.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d197e5e38ee---57795902271.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/65316977995.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/25993301518.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d2ed06c6ada7eb02290c8fd441eb9ee9/wesipunepagirepotim.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9c67020ae6ed6500da1f1d463d06f5e8/8352499691.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/ruluvanusuxus.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bc615cda3aabec4ecd87c6d150b2f62a/14276740704.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/9386939785.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607184852e31f---xewikilegenodonosud.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/84484963500.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/senagiwezofutak.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/fujaduzawowadomubidugurid.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25fa0db5c---purobirevafegopokelun.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/bubenedadad.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d16a3224c2b0685ce3c8255c76d4a20b/depudavinizip.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a1459b36f4c4395fac8a71e6e325202/64361416807.pdfIn PDF document text
    • http://kme-kme.cz/files/file/39462084560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=converter+iz+pdf+u+word+free+onlinePDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 17348 bytes
SHA-256: 8d506ddc39bb85183575acf94bb987fc0ec66a7c6c64f4f045201abb74a590e5
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 10504 bytes
SHA-256: bda287b999b078d213c921e3b2c682cfd75ad991b147fd44a479b6ab20ac77c6