Malicious PDF — malware analysis report

Static analysis result for SHA-256 b425ad57ce0d212e…

MALICIOUS

PDF

80.9 KB Created: 2021-10-06 22:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f38e0f86a861830f9cd0258afb388db SHA-1: 614a71ca9bdb334b80da9e406fa3f66cb2f7e583 SHA-256: b425ad57ce0d212eb8696747746718265e75ee81ba64f192c29f09cf8c733b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and heuristic firings strongly suggest a phishing or malware distribution attempt via a link farm.

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdf In PDF document text
    • http://huyminhplastic.com/upload/files/wufajonugokogevisadololas.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/21cc654da9rmd6prd7693k52a6/wososa.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/46670983088.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/donamumoja.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202110050931529181.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vovarejisojenalalugekinin.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/20509671535.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/xugigogatajosixurubupon.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///sakedemonikalavoxatijoku.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/domuwesu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kigorebufeperutu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/66619248762.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615c7a3501302---69942845690.pdfIn PDF document text
    • https://bachson.net/upload/file/31769107217.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xelul.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/51233930279.pdfIn PDF document text
    • http://immopolignano.lu/images/tomubasogumofosezaxumewo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h22t4k0nud4dlfs29bql8qaits/72639288215.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/korodepijerulu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/56902748627.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/ruzazugekasevivixogadodo.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/831695121.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/6582106583.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/fipipidexajefeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+does+it+mean+to+wax+philosophicalPDF 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 19300 bytes
SHA-256: 66313be38f0c2176ad7d63f53ade3b78d7f30eedf65eb3bc3026d7db3238aab5
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10860 bytes
SHA-256: 77468ba8dff815fcc49ec01e3d71abb6c677cf62df44cf00202342a4886efe68