Malicious PDF — malware analysis report

Static analysis result for SHA-256 17125279f3dbccba…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 01:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94d4ba58392de6a0d25ed328100e01d9 SHA-1: 48ce3444205c9cd9e537f3d3778cfcd5257ff6d0 SHA-256: 17125279f3dbccba2e755d0a79e51cb5a691a376657eb41965ad5e4777b8cf8e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://slkuang.com/v15/Upload/file/20219201312282596.pdf In PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/tupugazuwabarosovex.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/070e61659e75f5f6d0f0daac5b203fe0/56700520069.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/26629898497.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/38904488866.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea1b82bc2---84093772135.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ae3fd9695---bexusapabuvi.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/patufujekesejedoded.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109211810372353.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210912163303.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xowidetavogafefimakib.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/1468014159.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f4b8638b---lapile.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/fumubefunupubenis.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/xekotapaxerud.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/rebutubusufumomupeposiso.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/25153376918.pdfIn PDF document text
    • http://demkapi.com/resimler/files/loxukofevowanukapozanuzo.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/wafivejiwunuwovegolaxe.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/30295087772.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9109e2c66---19839671020.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/tuwerupedonekubijokojuj.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/zifokajitomaxijade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=coc+new+hack+versionPDF 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_off0000af22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF22 10456 bytes
SHA-256: a87fc05938f3187fecf640f6a553ba2750eb1148575d40ff2270a2c96c83f3a9
font_01_sfnt_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 14580 bytes
SHA-256: 482b1d258325829e018f737654b5c487c2e1c00e0b0b3992b41ebc0b3802018f
font_02_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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