Malicious PDF — malware analysis report

Static analysis result for SHA-256 023fcdb32de352dc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 06:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfbf769fec62f3b677648c0dab5965a5 SHA-1: b79ed8f006f5ad8ca01c0d9002c27712b4be14a9 SHA-256: 023fcdb32de352dc24ea25477696a87d156affe74140ec4e8496d844cde9a8f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=bussid+new+update PDF link annotation
    • http://zoekidsworld.com/userfiles/file/20982377492.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wewexunikusev.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/85427877262.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7831b78f3---bosinite.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/zurokepovexivinexo.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/5778461714.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b9c53785---46808321702.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/892e0c30d495275a8c19d2c0ed73e746/76210771784.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/lofaligilupo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4rn0lti8ejhesbk7qs44lq0nm6/bufitelodudob.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/53046029220.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/7025873858.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/92881611965.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133214b526c8---78575617495.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lesininimeletusizezef.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/66562862579.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zisawosamop.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/mekodol.pdfIn PDF document text
    • https://afma.pt/site/upload/file/nakexiwusidajukejewur.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/37815809076.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xixajovu.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/figomoluni.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/57549686744.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_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 17968 bytes
SHA-256: 4b3137b726bb319039142b29dd404d1916c79d3c22bf05e850d2a281c5b9bbab
font_01_sfnt_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10356 bytes
SHA-256: 70a0ab7062facbd5419079d473a90cbc5cc09c7aac32d38cfe9a7a2502904d99

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