Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b50dca832a2148…

MALICIOUS

PDF

93.9 KB Created: 2021-07-14 01:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24688ba57ee36d3fc1370cc722019132 SHA-1: 3ecd00b8c1b54395dce4245f336181d6977430e8 SHA-256: 43b50dca832a2148e6aa8ba0cb47e8e44485f77e19adfe73760861903fd3389f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/607f328857df30ec16a6bbee5a299210/juzadanivewiwexan.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/58ubrvldd07i4asau3s75ofl5t/75930777211.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/78190611919.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/dilowe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806be5a17a6---88640099779.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22c1a13d746fa91cd60666a7aee08fde/25885466003.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/sidajenapaxobukara.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/679ad401e74935e0f88ba54f0bf31419/zizovebirofupa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c28de388565---zogumixetagatedox.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/82786101424.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc723965492---bolejufujokezinegeponov.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8v2sm5v4d9qosni9ov74bgpic6/lilixabavupexixubatupi.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/78907248423.pdfIn PDF document text
    • http://lucann.com/Upload/file/91252861330.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/4073227975.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/96132989562.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/vowovuxiwodonosonatodot.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/efa4b2d2677dec534a512c1dd84ed243/jatadivedurobuwoli.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pkcf7a9kdqrltkiq4ifv0jlabe/18385050171.pdfIn PDF document text
    • https://amblamy.ee/upload/file/21877204761.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/zexavepexato.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fc286df42ce52d9d5b30311038ac5702/buribivasodilenika.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ad75b61---pikupugevepuriwig.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/20302672034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sets+problems+and+solutions+with+venn+diagramPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 17420 bytes
SHA-256: d37070879363a66227a2b1c14fcc16887b6e08523804eef56b9bb06256b02172
font_01_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 11304 bytes
SHA-256: 3ab6d8ae96a8ef890e8ccb8089fbc3008138a0938adfdd50026e95d3160ee77c
font_02_sfnt_off00013b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 16300 bytes
SHA-256: 6b781ee7db4c933cf92b04c7254db42a4c89a5cf5044b852e69a5f251c2d5ff4
font_03_sfnt_off00015173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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