Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406f19ff9bf30e0…

MALICIOUS

PDF

150.0 KB Created: 2021-09-05 02:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce97f9970c6bdb8bbabce1dbc043c4cb SHA-1: 0d73f9da31434a90e2bff831c572f9730618768f SHA-256: 6406f19ff9bf30e02d07a393f0219970988b07d0856d1b6c2dd4a27bf417f01d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://caribemed.com/userfiles/file/gapuxukaligamato.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/adcec19cc2e020e7a213a7181b15d536/33898169355.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/xipujuxeninoxevojuwu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16128172d9f26a---bejawevatiwesutusunoz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb7dc669d---bozopafituza.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/sadedexanodexupebim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c604f5b649---nixazewaxevavo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/firogikijenuvaninoteze.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/690d82c2b3dca53bfe56d97182fae7b8/18749355955.pdfIn PDF document text
    • http://all-premium.com/user_file/files/50338418028.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/vanikoziviw.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/43773645577.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/29782339391.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/23175008968.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8c2207db---zilexenigibamik.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/898813479.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vuxafeke.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/katopabimalufijezivido.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/48307756860.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/bafevozedo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f8vvghgk4vplh25lk74k2pjoqo/buvudejuxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=warhammer+age+of+sigmar+skaven+battletome+pdfPDF 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_off0001e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E762 11236 bytes
SHA-256: 0cfae8d56fd04cd2d6f8b5e07b437e3f60508683160087d1c2aec10de1f9390a
font_01_sfnt_off0002011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2011B 18572 bytes
SHA-256: c591703136a821e4d8b3ab49d218d97d74915bf12826054f181b25984028622d
font_02_sfnt_off000231a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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