Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3fe35076ce90de…

MALICIOUS

PDF

127.9 KB Created: 2021-07-30 06:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab0f81a47a083b95e936adcfa11ec658 SHA-1: 0eb092733776cec4ed4ffb82424ec14a70167428 SHA-256: 6c3fe35076ce90dea833ac5d128a5f76b6e1ea06b90607b7995e881c572b8b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'Phishing.Trojan' detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://luvnchrlysenglishtoys.com/clients/861429/File/25624655046.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807e2827d6---7649005518.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/11514220587.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/de33ad93da2f740894e947054ce9b82d/lasadoz.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae77edbaa---bepitisax.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/321f54a8984f21fbc2fba14c73c2fbbc/36496365273.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/dinivuvoxudibiv.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zutefaror.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa3dtvpkulusuloe4om3c29oae/31425763234.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/a5d68mlmglmufn28n7qittb5p2/70396414137.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ging8qk9e26c9pt3kl58pcaa53/jarade.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/24fu9jo33fr4ktafosgq5bl5lr/fegiginukalibazipodinobew.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4844824f6e---jozimibakorido.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/63840860874.pdfIn PDF document text
    • http://primaneighbors.com/userimages/padoxitugesudas.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/zesewaxugowopuxofezowoba.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607537d6aa342---nutir.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/rifelelowiwizawanodosidu.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/75626900657.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/ratokozonojetewomepe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160978b1d2d851---samukobiwusirepazowizexij.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xonasidoxexirexiri.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t34vb6k113s88chc7plgdnplff/57864602310.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea8eb5b3c---girezuto.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5c4aee065ff098dedc56f185c9081ffd/mafidikamavov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=avatar+a+lenda+de+korra+dubladoPDF 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_off00018b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B94 21544 bytes
SHA-256: 728815b697a1d50657c90cde419cbd869bf10d1a9216f59e04e89eb2713d7bcb
font_01_sfnt_off0001bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7FC 10360 bytes
SHA-256: 1cb2c5e6490323243faf4f9d00b22fa27f0e3e6b4139dd369ff2001ae10e1322