Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33872d71862cb7f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-10 05:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7861e10ff5d507656265991a537c60f9 SHA-1: 9ef4b806897fc72dc59beb24cbfe4cedee20abb6 SHA-256: c33872d71862cb7fc8d3eecc40f4f52eac39b071cb9b030f4a9f29d83abdc114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These links are likely used to redirect users to malicious content, potentially for phishing or to download further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/90ea5b06c218e6216125a717236ba6b7/pejilexidafekijoput.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/77456215486.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3f482ce1cd67fb45440b668775f5aaae/sobigawujarowuto.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/76953104887.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/81f3b461a5640d2bc817d8d2bc6700c4/19227491469.pdfIn PDF document text
    • http://amdind.com/userfiles/file/sutularelaxibunanok.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gft4ho3bm53olij46j9ufl24dn/mogubuna.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/61296028033.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827468c81aa---pixozuledesanewujetebeb.pdfIn PDF document text
    • https://digireg.nu/upload/zonawasapo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d040ef4038---bexiluloxazofeluwapebis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47200b65e1621d0da1a37745d0bc0200/25426292392.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71c00b56e7---jamabonuguba.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45c467446fcd723fa5e06507f0220d03/96981856003.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/69630748440.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/891fe44096a86651da905e116fc78114/vadudagifagenijelanepub.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gopedavave.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/40006540586.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce116c594---maxewaxozoso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a7107554---povixidirafetajotunimutu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/86fa8abb9a3ea32dd06451d6ab2aa54b/40984143642.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tanixopuwutupol.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q0pkqtu5ih3s9eoo0r1ihtlkfc/futanatetim.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rqhv5nbe21c8u5l448sbmv1obk/84841508657.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16090937f0fc1d---lolelofipaterureturufux.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/36548637961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=carrie+underwood+and+vince+gillPDF 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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10564 bytes
SHA-256: 3e696f7627fe80424010da65add4da40e5db1265c35cbe263cd3f2787d9b922e
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17272 bytes
SHA-256: b8e87e3ff0cac7b160e5aebbcdccd861072d5dcffdcf67ccc85cbe9051347d86
font_02_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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