Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dded891b97134d…

MALICIOUS

PDF

84.0 KB Created: 2021-07-18 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e494f22e425bcbcbab6f41c3b7cbde4 SHA-1: 0df066f22cd098adfc45051440489c4736d6377c SHA-256: a8dded891b97134dbfc20e7f5eb480464a560834fb2cc5ec24deb0f3174442e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070929c1ac05---86973391397.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a7597ce47dbfe96086d4f46c573ddbd/wiwopiwumenozepowalos.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8t7hos08ds404t30glo3hpv724/49206800320.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ea0f1985---18851903731.pdfIn PDF document text
    • http://fitviewer.de/files/file/11071753623.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/15424160111.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/risiwobilezowubepi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/735a48c178d9f4bdcf2a2503617d1221/jonota.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/webuvopemugur.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3473d61---5143980586.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e03239640475027587e7fa57b1761494/pufidil.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/id520sfapqj5bd00rjgbk907jj/jekubod.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/98067514916.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcaf3f2ea---guwuvefepaxawezoxedorok.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609599b3784b9---6722971868.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/98364139709.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/9973873761.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/kukuvafujedajogi.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/87521463375.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dowomarodetoputus.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/22700436852.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/71183384220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bite+from+a+vaccinated+dogPDF 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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 10724 bytes
SHA-256: 3eca72aa3814872ccc7b153f9f47d948ca2969217848cc58fc24b9b15fbbc63f
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 16708 bytes
SHA-256: fc04a53dd98bc383a12720d1bf46b8f4dd56b6a6568ebb2c6cc88670dc2a6a03
font_02_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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