Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a1010f1070eceb…

MALICIOUS

PDF

83.3 KB Created: 2021-08-15 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26f2b195c95315a305b9af2dfed008df SHA-1: 7c46c9c2cc62c456823918db75f788e783c8a47e SHA-256: 60a1010f1070eceb745748ee65d98c2b7fffa026b72a049c8607f384ad1296e3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on compromised WordPress sites, likely to facilitate further exploitation or phishing. The presence of a 'download button' lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6437379c3c---kusowit.pdf In PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e61d35de506a6c81699d0738a7ab5264/17947858536.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/71534630658.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/90651246272.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3b2vh5va5vl18f0s37g8nt74hj/47556187985.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cd834afd62b42f3436e2ebe6b4be3b47/nodoretikurepimeka.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kefisuvoda.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vubuginebejuvajiwemapiba.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/tokisalu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6e8a8d7c---talipilo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e25ed953c---32442077269.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jabaxufoxojemitemelole.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/fevoxuniso.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf51a2e3f4---71596619728.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4f9db6804---92883660111.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/13660080466.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/12527649469.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/29675169587.pdfIn PDF document text
    • http://naviway.su/upload/files/31876666011.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae8c0d974---34269395545.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rujebepibutitolepatuf.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b69686d3aa7c0a9d213a74f102b4238a/felijibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=woolworths+careers+application+formPDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 17156 bytes
SHA-256: d560f3cda6ed88d3a4e7dccb1ba3d450e18e2f7eedfb1ece104ff56bc866970a
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 10824 bytes
SHA-256: 5a4af8b2d00be31a5ce8673e83e1eb30f68b4c4367cd228b8a423c54ba2c29fc

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