Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6d12a72ebfb1e5…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 04:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ad91ecc325272c14506d5024eb14e028 SHA-1: d452ecae0ea31f2fda1d430eb5f4afa182399a85 SHA-256: 2f6d12a72ebfb1e5453744f2f6390b85dfe8f8f2cd5bf6e7e656cda9aa392695
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, and a visual download button lure. These elements suggest the file is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://basumati.com/app/webroot/ckfinder/userfiles/files/xafamola.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/ludopewep.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/daroragebegutunovikofe.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/47185715707.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d55b743712444f0aa654bc0ee026a79d/23882541899.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/66910660406.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610b25b2016cd.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/85a747dacc1d9cd64c85a10e8760c0a4/33036261238.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pimarubagejixadasa.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021081605294745.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/74378091644.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098373826a70---9217551620.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/noguxisapuwep.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/27271205311.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/bakemokagexukufamipumorer.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/97772030948.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9808287844dd1be74c0ee321caadfdc5/18829268858.pdfIn PDF document text
    • http://citra.cl/userfiles/file/37871327566.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tusiwasajarabedaxop.pdfIn PDF document text
    • http://gdgom.com/upload/file/210702101317294013t1tgl976416v.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=star+and+lovers+tarot+combinationPDF 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16476 bytes
SHA-256: 7391b1590c954f690f86d3be375b3987bcef031d2668344c84286c8d3ab0168b
font_02_sfnt_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 10812 bytes
SHA-256: 838d7d6036de30b26204b509decd7e61f56c2df7d2e967227e39cc61f99ae504