Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1d3943962d158a…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 06:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: feafd17b6abc07c1c59f846d40bc1565 SHA-1: db3462c1375feac72392fd0fd92f0648e23e31b1 SHA-256: ec1d3943962d158ac154f613bc6cd1de70d2d40ac0bec7a4ad6796ceed02934b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://thekitchendesignstudio.org/uploads/files/34492095718.pdf In PDF document text
    • http://tao-oita.com/admin/upload_filesfile/43235269000.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ddf74412446dca2affce421bcf703cd7/zudunedusaxejozow.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/firaxenazusape.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614562a3eea45---25731893644.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/wekasineregixozuti.pdfIn PDF document text
    • https://kratky.eu/files/file/48197973686.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/pexikagozoni.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/noxebuva.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/selunipilikiveverojofepum.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/janetixunazeb.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/50861442052.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/lojuwupofodudadaxisotuwe.pdfIn PDF document text
    • http://sivam.pl/files/file/11974767872.pdfIn PDF document text
    • http://roocenter.ru/upload/file/tejilasisido.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/63119920057.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/25841515316.pdfIn PDF document text
    • http://mcutech.net/files/fafumunit.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/86749677562.pdfIn PDF document text
    • http://fkhd.cz/data/img/levovulu.pdfIn PDF document text
    • https://keongracun.org/contents/files/86763183334.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615106de2c3d5---leralijigarewakaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+mute+rejected+mate+by+twilight27+read+online+freePDF 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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 11476 bytes
SHA-256: aff2cae6e16ef52e1b83f297b6621a480083164f2a0a2acc11e98968e9945d4f
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 19200 bytes
SHA-256: a0dc307d6866bd1463fa0efa98cf7d4fb85b60dca5132d45722d186403b82ca2
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1