Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b37f09a5cde9c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 02:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aaeef27e39d2e5b17c885d6a8dd499a SHA-1: 5f114273a8c6a53bbeb5d3770985431239b02308 SHA-256: df9b37f09a5cde9c4b5c641cb2cd9e769318c6ca83d65b1162b306022db584b5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://obras.ru/sites/default/files/uploads/30900395282.pdf In PDF document text
    • http://idroter.org/userfiles/files/zomufepulepukukonusezal.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a330c5bfd2b---25339494980.pdfIn PDF document text
    • http://hak-al.com/resimler/files/xojajoj.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/41552466553.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/83495596296.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/47358179251.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc354bf386---nidubikunova.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d72nb05rhf9672c3ng89t2eju1/35758479036.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/70111265565.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/lanediduledomupakopa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e659e5f36---38842147168.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/dizobanodudu.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/mebogolusidulobes.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081b847c3c64---bifafi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05bccac36---dumida.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/64907787918.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a0067d824af49ae99bd2b0c37911b7ed/14672804946.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6e944e9b---88564142086.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/692c2a8dd7bcafdcefebb732b01e7cfc/23316216106.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b1c53ce88---bavupaxivum.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210626_15F94989DE5E0800.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/vajujid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pre+nursery+tracing+worksheetsPDF 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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 17372 bytes
SHA-256: 344ce091b0512465bfcdd0a012526e1ece214861bc0af30aa5cb2bfdaeeb9135
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10856 bytes
SHA-256: ae550800da9d3f2ebfde772843e9b6f6bdd8374998ae13b2f1259d67cb9e549d
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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