Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9e3653db345f01…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 13:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8da50b1460cee9a3fb90e03086a9110a SHA-1: a69044cd620929d9b131a0be17b9baa2fb59559d SHA-256: 5a9e3653db345f014dfd20324a2addfd725c1306f9492455057c18d08ee9d191
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The 'Fake CAPTCHA' heuristic strongly indicates the document's intent is to deceive the user into performing an action that leads to further compromise, likely by downloading a second-stage payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://pistant.ru/uplcv?utm_term=human+verification+in+gta+5 PDF link annotation
    • http://scamps.biz/userfiles/file/10187817429.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/xedovesufuxuvifepesowaji.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487043f10f---numaverafopoderedarejuju.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/82488221585.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/winebozudujup.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/62760858794.pdfIn PDF document text
    • https://ms01bet.com/contents/files/59978054123.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/58016267134.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/4035510603.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77515166037.pdfIn PDF document text
    • https://biocoils.com/img/file/kawefevabuxawev.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/xunetulokamifegukifoj.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/10027613161.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/wixemoku.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/10217181183.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/86387385511.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e11528e5b---58702739926.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/kipojuwadunasuwixa.pdfIn PDF document text
    • http://tlznailspa.com/media/files/faxib.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xevafaropesuxaza.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd89c4934---loregurenotunebiviburuvef.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/foror.pdfIn PDF document text
    • https://loctra.net/userfiles/file/46767031417.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/56482396223.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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 10756 bytes
SHA-256: 90da8a8c631afcb827163966af201b23a93c5d3b7ee8470c27895e02135a8324
font_01_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 17780 bytes
SHA-256: 1832cb007e8ffe200b0a4f01cf0f8cbcb5d63278c9b412de89730842c5aaf4d5
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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