Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e3a6aaaa235c21…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 01:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 620a59aebd59444ee9171c17a59a0fae SHA-1: 645e4cebf72fac8080bac48f099fdfe8bad03fc7 SHA-256: f6e3a6aaaa235c219f42fc3df8fd2c734c48253f5535d8f1d58ebf0acbf3f4b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tandartsindex.nl/images/uploads/fomoxulanesegekujo.pdf In PDF document text
    • http://ssatripoli.org/userfiles/file/57182650466.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd25d08a4---25690625836.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/visaxefilap.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/14310271451.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/86220175180.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb250c0b3e---74258358316.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/85009628276.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/kezipopo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/pobilegegevifabuzanavomok.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/iiuh4en3pukv48jv5fjl1q74ll/4859313693.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/679bd26a522a791e28b2541318faab3a/vizarototikogeresusekuto.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/xopovurerebagamivimijogup.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca109bd74d---98702057680.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sebadogukenizesibiwi.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/gufiduronoxoxupi.pdfIn PDF document text
    • http://allycatering.com/userfiles/52723683324.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/paa8notelqc83c5rjcb6j22gig/zemezimesolasitanafodi.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/kuluzagisekapupabid.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/58356698737.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160962c770cfb5---roxusuribibig.pdfIn PDF document text
    • https://totounited.com/contents//files/84822507209.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/81087642450.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/12575991190.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/mopogivatigagagiwalixew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+merger+online+for+freePDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 10268 bytes
SHA-256: a5d469c9929d668da47c992c5f1b8e67463e6059d8326d5c6d7a220b26db5bd0
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16328 bytes
SHA-256: ad869e720aa9a0dda586f34e7fbc8b52d3001ec53f5d5f9f796a6f22d5718a32

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