Malicious PDF — malware analysis report

Static analysis result for SHA-256 9854409bfcbec9f0…

MALICIOUS

PDF

78.8 KB Created: 2021-07-17 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e216a97735fdadd2409354be539195e9 SHA-1: aa5136e1adb13f0b2c2084faa15973a060744c03 SHA-256: 9854409bfcbec9f0b79adfb6d460c9550a0ee60bacd802ac3bbe32a067b0a43d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the characteristics of a malicious document delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6125

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.zaluziemalina.cz/userfiles/file/45263558997.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e67c7a9fabd09c0444c0604ac67a7898/bapojapumetagedemu.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/79615801043.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e2bbc956---13405900736.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761a9845e25---6070462166.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/nujejagurugapuvonegamolil.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/mosukupiguvuko.pdfIn PDF document text
    • http://wsm.hk/images/files/pogowugakado.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vexekekula.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56588735049.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33d9e1a51---lulisojeveru.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/loviwe.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624056714.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/3073301461.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ebtomltsh0vk5l4vqf2pmckhgl/repuxepizak.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cb681bbe866628a1f414ede2c448a00a/20869213584.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97565779390.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606da720d50b2---3889307227.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c84ca4d5---4749503160.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mem84u1uk4h9v7o5o4kfksnff0/vusuw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a63d039a1ea7ee95cbbc3a7030a1a6c7/sevusalitiserisixafiw.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/26492663719.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3f4e28a9b2572296c7ee2b2df52f85ed/72059991366.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3d7bf6c105598bc6c38fb9062138a452/11161496858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sst+class+6+question+answerPDF link annotation
    • 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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 16688 bytes
SHA-256: afea90663de792bcf9101722fd0f6c5a6fe60a5d869ac7b3a0573e4513e9c10c
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 10796 bytes
SHA-256: eb40c75b2bdaaa73b827c18323aa52e28a0b375b992b29add410b68e44d0ca18