Malicious PDF — malware analysis report

Static analysis result for SHA-256 860c5ec7ab2cd2f2…

MALICIOUS

PDF

90.0 KB Created: 2021-09-01 11:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0a986caccfdd765ff2b9fa993dba022 SHA-1: 92839e4d02796312af56f1cf386312923768d585 SHA-256: 860c5ec7ab2cd2f211714d5182c841c1737dd38c5d63ed626224606de3f90426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://syuncyoku.jp/upload/file/62613371757.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4e832d5f4774f952a0757646bbcccad0/64216469648.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe8d9947e---ridobuxasutifa.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/bebududej.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d089ac68fc---fezodefevozupukegiwigu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vv9i6m7bl0licutb4vln6pnmuu/38167001857.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3326341a---6185057023.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82800a294---pezizewoxojuzit.pdfIn PDF document text
    • http://salkim.com/userfiles/file/lubewibudevumipazorido.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/68071001639.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/ginadigejorurikamalabepo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/63412410944.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/7921153325.pdfIn PDF document text
    • http://surtek.biz/image/files/20150121_132909.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7ec1a7a895fbfc709a95c630dabc11f7/90448749411.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a890954d40d---nabusewoxovuzewutib.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/37779242128.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16095318f74c49---dupufinetixidomoru.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/nopatipiwepexoviwoj.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ded36acfc0741278dc0ec17ae94ba871/xadosipasojuvufim.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/94573773050.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/48912315035.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/39682951242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=all+of+the+following+diseases+are+caused+by+arbovirus+exceptPDF 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 11488 bytes
SHA-256: 3ad59e15d2ec72a831060f05994d4065f46052dd83e7c1e89b468bd320837259
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 19592 bytes
SHA-256: 4a193dae116f3af469d61c371057440539361a6e4e24b419999b4775c3ec2a43

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