Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d08e274a104599…

MALICIOUS

PDF

94.2 KB Created: 2021-07-25 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c789031a02af26616c9b247f83822f8f SHA-1: c99594171cf8b81ccface0c6c169a6ed20a2d9b2 SHA-256: d8d08e274a104599aabff6856fe8646af713ae18bd52534965da1ce3aca6dc17
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://vietkinggroup.com/uploads/userfiles/file/saxotubusinatajize.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f119bf1d5---welulogiditukavaxutevare.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vfugtlnbsa7hej7omog3sgf3u6/zinenimujivixuj.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pi503tc4l58rq6i9d0i42q9o15/ginaponatupewilome.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/82115431727.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0bec7d24c---7475469611.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/acf63b72ebf7f4857727a3430098ae80/23074853883.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a288d7ebe95a8d1fd133377d0830020a/96299230638.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9b889f1854fb2aa08ffaf8bfa2f5c096/85861828868.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wirebidomi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/tudevikubegaketux.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/10114539629.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/39266865255.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe2b3a6689065f0625e378dfdf038213/topujapomupikigupanu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e116b7c59d95a89609cb7da51127728/vigut.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f62796446---poresuzemekit.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6f95d3ed---zezozikapuzexafelizaxaju.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ce11d73bfc258f65b8925cb9bfb92800/tujulun.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074350200b35---xezab.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4fe42f84cd195d42802247a2a6347487/jelopofilazokukoxu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5789c10f12caa266d85c268b4f979c93/kusujenevo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/rebugufavanetevofaboxak.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210719_2B5516AD2726FB30.pdfIn PDF document text
    • https://termofriz.rs//files/24415493701.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/71290869610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+frequency+in+likert+scalePDF 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_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 11040 bytes
SHA-256: 91b57c6b0c552a990620d61cd489d7f9f198d21c0c7219c74d1f82ed4c6b5da6
font_01_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 17944 bytes
SHA-256: 0c05e94a2195b4a04fa230d9d68134d9a41947e4fa48ded05ef1a747242c6cc0

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