Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb70461f2ce5aad…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 23:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 257813826d2e47269985c6427d74c3ec SHA-1: 47262c5328fe6d499f4414967e665d5f5ac9ab9d SHA-256: 6bb70461f2ce5aad8da5c603245798d42130e0336fe7bbaec711fb7124e15828
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many links pointing to potentially compromised WordPress sites. The primary purpose appears to be directing users to external PDF files, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d586c73180---72799921101.pdf In PDF document text
    • https://szallas-karpatalja.com/upload/79578291422.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/80433924578.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/lonir.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fffddeb4162---52154246176.pdfIn PDF document text
    • https://angkalaris.com/contents//files/78830159182.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/24604247530.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kp43vjlcaa917e14tils650ps3/fejovamopuperanafadolamaj.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/fumuj.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/66140353018.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/52722828249.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/natefu.pdfIn PDF document text
    • https://foulardfotografando.it/file/ximaxa.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vozorupilixarepa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db8b880e---dapovaw.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/67983992134.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087158de5061---tujarefebamowi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bezexusuziloxi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160792cea0a803---9128327043.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/vifokibixivovuwusuzirezex.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607610b5c5e8b---suxaves.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/gobixeliramimoloragam.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a21a2818c858aef16bfc5f871c588b80/24903116902.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c954f5a7efb---xafowufitisagutufufor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=color+palette+with+blue+and+yellowPDF 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 10792 bytes
SHA-256: 06c8278c58ebd678d681b89617b06f4e33021374adda2f37a215979489e32a9e
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 17368 bytes
SHA-256: fe67c1d1493178d77b29da38931bdab45bc2cd3fb7bd8d8f84cbf2af4b0569a6

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