Malicious PDF — malware analysis report

Static analysis result for SHA-256 897c252fac3b48fe…

MALICIOUS

PDF

111.0 KB Created: 2021-06-26 00:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d3ce15825de82f270240226a4e5b805 SHA-1: 28ec709eebefedfb813f83c72162fe1a55fe5009 SHA-256: 897c252fac3b48fe14c7c2414d797197ac1bca010cdc8f2e3b6c7e5796951da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique common in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=icd+10+for+debility PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p8u54q3qpkrmkmqafvku0c4thk/9876790398.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180ef83ba8---6093219246.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lefexojigasi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73812532005.pdfIn PDF document text
    • http://stevis.cz/files/file/jutorof.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gudumelavenesumevofok.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7c2b932a---norefed.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea7e19db4---86269590954.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41ae259e07---42349442182.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25fc9c6b4---rozuwejizewibi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608586e377733---75702543962.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6902b037d3---funaveva.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/peponigepitemipigip.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe0d71753---22634568920.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3c5c55ec490d07e28299f7e9c8740fb4/tenevabimopumexuzilu.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/wobojofebobulanevifimus.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2ddf3298---nefonasulivik.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3bb7027ece434f88d3a9bd3b02a425d7/40858372324.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/mejedutiser.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fadb8255---reranej.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210608_304A01B73CBCACA6.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/98773587958.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/movepinolutaxumijefaw.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_off00014f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16793 18032 bytes
SHA-256: 03ee6965cb99be5c8e3fff67d7143578a898ac983c8e8007c65e85ae6394ee92
font_02_sfnt_off00019746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19746 10416 bytes
SHA-256: 3de5188f64155decf4fee44dd164cd180fd1beb398de3719ec6faaefa10e4cd0

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