Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b62e2dace3f7d54…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 04:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1e5e86db1174f58657b1aaaa594e309 SHA-1: f181ecf80397e5832ef041b476f98526eee43c76 SHA-256: 0b62e2dace3f7d54f3cb60ff66c58304fb9f9390fbb6fb865ccb0e67710e70e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://elandtour.com/FileData/ckfinder/files/20210906_AE884584A35F59C0.pdf In PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wulaxi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/jezopewobibavilima.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/59533436137.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/8977853125.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wemezu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tekuwetinifolikikebiruxe.pdfIn PDF document text
    • http://snft.ro/media/file/popunukuramigigigugetopaj.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/josalabupodev.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/87760604084.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/kofurikobusakeduw.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/40107882998.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403935c7ccc---75148490870.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/voviziputijojotiki.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h75fq9hj6408m0vvrhbbk8rne4/muzusamusaxopalegureb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046c7e3532---45547147712.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8064012ec14b3d82dc1ba0b903182a80/58826704344.pdfIn PDF document text
    • http://innotack.com/userfiles/files/148684243.pdfIn PDF document text
    • http://njxinbell.com/upload/files/raribesavowokoperase.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f658d4a99---88081856796.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/99908736158.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pelirekadapexilev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=watch+korean+drama+androidPDF 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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10504 bytes
SHA-256: cb23a10f9db0d29c8d9608843a6ad477ab052506d909e1207c7d96255f5756ef
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 18116 bytes
SHA-256: 36457f4ffb6d4c1d4c4d2b935eb92315b5d0070d1fb5be770ddecc41f52e91fc