Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb216062fc6bc9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 11:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df65fe1edbd8e64de3b3c5d259d88c5e SHA-1: 287a2904fbd855e73fd355188fb8f15c3c8ce327 SHA-256: 9afb216062fc6bc9a98764bbfec6f14a0b75d3e654bb0159090b0647f7d3f241
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=disable+chat+heads+android PDF link annotation
    • http://phanvienphianam.com/uploads/userfiles/file/zazimesakufelev.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/jonejogixutef.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/luxoka.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/67892404314.pdfIn PDF document text
    • https://pecsikult.hu/files/file/wanos.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/61205706282.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/magiwakalo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a22a91f---39994020260.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/51330001069.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/74651207804.pdfIn PDF document text
    • https://lecachet.fr/docs/files/76242034970.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/29450682915.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/69856041687.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091510407094.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/ripulur.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163049582053050194.pdfIn PDF document text
    • http://gewald.ru/content/Files/32469766013.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/masefixilu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/10488169666.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f5138b7e---22290097805.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/49752624016.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e488681b9---98934010498.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/16054383224.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/89888441891.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/032aadf77633898ea997a226861ca060/1344368609.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/pokowubilug.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0a61c551---4218407552.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17672 bytes
SHA-256: 778de288e62a6b1bed00e91052d60769dbd9dccc8a77dbb92ec1b5a3bfab3720
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 10608 bytes
SHA-256: 9dfdf465fb5d46f35e5672ac31479f1c29fb745341cabce8173bd789cf979a55

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