Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8186d1b848cf7a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 04:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 740f7a956c7356a18a123d52300eb16c SHA-1: 3b57a45224aa823483a8416a2854672301fd2db6 SHA-256: 5e8186d1b848cf7a5e1e3789b50a7499e22928c401a4f01edfb61af5be439721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/904b849bfc18995c38e27c4ba2bf5add/11302859441.pdf In PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/24760701534.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/29cf68176bca6252e74aa48d00f04e49/zafuzurama.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/katepobufu.pdfIn PDF document text
    • http://tfforming.ru/d/files/80917366364.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/vixiwiludas.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/51870810904.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc69221dd---pipugavurisitojof.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/94637203998.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/fijopojelasujedubogiduvol.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nawul.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/sogokilesaratisadalotule.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakeforekajebu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/170b99f505b90df40cdc2dec463dcb6e/fipuratarolizemibubokufax.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tedubepemipebiz.pdfIn PDF document text
    • http://deauville.ru/files/file/58775015209.pdfIn PDF document text
    • https://ienter.bg/files/gulalabijevafefaketa.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/85131001614.pdfIn PDF document text
    • http://learningkey.org/userfiles/83479024537.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/43468443894.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9b6cdfbf---72602655372.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/26c1f8394e3f1daad3f3311d477775e6/suxonojudup.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/64733856204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=catalogue+philips+2019+pdfPDF 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_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 11168 bytes
SHA-256: 26afb667749f68ed55ddd90c23b6aa72134d28cc9becef40f4cccb6eee5e73e9
font_01_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 16756 bytes
SHA-256: 717849ceabf096b5ec6e70727f825c76ac77f508e03ce93f24cd95aaf860ccf4
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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