Malicious PDF — malware analysis report

Static analysis result for SHA-256 528d72e20de01333…

MALICIOUS

PDF

85.4 KB Created: 2021-07-15 23:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c91a9d3c3d2db927cd5507608882c2f5 SHA-1: e59464ccb8b427b7eae8da34c1a7ab55895fd82f SHA-256: 528d72e20de013332eaf8d327d629c54b75d0984601787060a79bf64fb35a6bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=20+push+ups+a+day PDF link annotation
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3oi98tglan0s361ublqe3sttvp/wimotoveriberivasu.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/jurebok.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/87987333863.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r2j9ap3j71i1a0ukbt47j1qj54/sorepute.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083641b9d1dc---luxuta.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/aufsj667hg171d6rbhhnh8lsf0/debugebozonevuzemanawegom.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0124d92a53---99459569654.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rumoro.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/wubedoxivufup.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f885a5755f---dejuxugenurudobiru.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/majepowi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ab7690f4---97687422331.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/woxinalevovubesebarogu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f5v93v9hk3ab1jt1v1v6qot3i5/jegixivitakazoxufivigo.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/35661966585.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/74811436402.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6948176b---51681891383.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/febev.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609770d558b70---mevupababubilununabiz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba86498a736---25096634841.pdfIn PDF document text
    • http://fedoro.ru/upload/file/togulupawatovokajinakaxa.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9159b37db---fibodova.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/797509fc7116387bb79e2a957eddadca/pemagunokukag.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b4e568f3---2582586901.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49774de2d---jatinorexezuveb.pdfIn PDF document text
    • 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 16472 bytes
SHA-256: 1075dccf3bc3afb5aca2b2c0220ddacb80403a59b2651619f2588fdf02359238
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 10156 bytes
SHA-256: 0a88b796440cd7cf15c3d9e5e5f5472bca519b9473e0d6258d08ee23e430a791

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