Malicious PDF — malware analysis report

Static analysis result for SHA-256 4386214b16c98154…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff3c235d0929425679f9032d525e3710 SHA-1: 9b303a9f5d36c9f797606ecad31f14bc7c5a810d SHA-256: 4386214b16c98154e7785186c1f360e6b913fcddc8d2f46eb09a3936c0e68654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fgosvo.ru/files/files/69445558276.pdf In PDF document text
    • http://lgassociates.in/uploads/vafoxasujemox.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kipufimupal.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/18975827828.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/70392645.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/89441032105.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/51a559cb4d26931e5f66e269e9d6bcef/82422588110.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/92276000958.pdfIn PDF document text
    • http://salespate.com/userfiles/file/23777701211.pdfIn PDF document text
    • https://digireg.ch/upload/30976800968.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/jimosos.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/gapujiwowuziwuvufixi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/14812374276132bc4530f1b.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gibetafagoropabeluxoxiz.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/jopobidade.pdfIn PDF document text
    • http://htygroup.com/upload/files/femezixutiv.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275e0dcdd7---94481771728.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82959194865.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/wanus.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/67663728384.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/satunawutodeg.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/darakanifolumugorawipi.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/zaxugutasal.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140539b02783---49652028830.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/65788050188.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613accc7a8dd9---69123984354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+10+games+for+android+phones+free+downloadPDF 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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 17284 bytes
SHA-256: 9f545311217708fd7d359fe3b2e748857bb084d3f3fca776e9488d8d87a735f7
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 11072 bytes
SHA-256: 00ebef222b85070d7f860e6c3666bf80285c7e6c640edce3afe5bfbf797290b8
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1