Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab8321ceb171c69…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 01:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c6d7cfe2b76f0e6a4f4f76332666a8b SHA-1: 47df489dcaf352fb063e5101156ea2c594c87f46 SHA-256: 5ab8321ceb171c693fc2fbc256796da5c521f697be2b9272717d794e953cd5ec
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites hosting other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure, redirecting users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b5028def8e0544333a20e46a54ed9984/zogerogoxi.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ede15b83---kejojuge.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/8511678328.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/25319041849.pdfIn PDF document text
    • http://metapolar.hu/tmp/18799104104.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3b89e7f98fbbe90a1592d6fd2fa5a6f0/dopegaruputupumewinulu.pdfIn PDF document text
    • http://jarosi.hu/files/file/kikav.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kikotibox.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed69cd00---bewazanofew.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/80906886582.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088403e0cc1a---83047151341.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/37905657283.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cf1216a94---vasuseled.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/62802996789.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/zusakorivujosujilizuva.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/78690760.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90b20945b7e0e2478606b5d1b86f0e7d/74014365173.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/6330193223.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/67687686243.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/77912873653.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/1521912052.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/natojebapojodofor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dtvp+2+scoring+manualPDF 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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10872 bytes
SHA-256: 0a94c69ffea74b8b2338bd85f675707a1330f2550efc81c6f8693f1bcd8c363d
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 17392 bytes
SHA-256: 4c56157efdfdd87f2ea555dc26f0600f6c9ce03db31098411be01c96b38a3abf
font_02_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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