Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80bc1a100c23da9…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0463b38694f32f604799a10c7658e14 SHA-1: 607dc857ff56dddc0d1be477d5c6b7e3ca01a438 SHA-256: d80bc1a100c23da9329e9e48ce8cfcc4f45af0f86ef7a62ee9c7a2a462400d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://crysiq.ru/uplcv?utm_term=play+free+action+movies PDF link annotation
    • http://jikaramen.com/uploads/files/wifexovalep.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/pulobike.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11717805023.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109170551352163.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sijugenut.pdfIn PDF document text
    • http://webursitet.org/Files/file/wemuxujemefeturanugugajox.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/1402456154.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/8502528080.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109200103144674.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/72081598292.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d955f1d86f.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109070945156694.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://armanetti.com/images/vebumezapixelarubo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161389d36de325---88055939456.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/12354960208.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134233c897cc---31346547987.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/70685545349.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/verejolupajumaxegevokujun.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/72200007994.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/15857225316.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/93779470894.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15447767269.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351931d291b---58049402791.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/41561545085.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_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 10676 bytes
SHA-256: 4ef0f3d052d037806a0611afa2bab5a102cc81e80432e81f56a8a876c31aab94
font_01_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 19388 bytes
SHA-256: 6cd6a3f88bec88f091154ce0324c526862609d9ff63e79a33f9accefcb0af3ee
font_02_sfnt_off0001686c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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