Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d24e6655136bfc7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 03:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d083074f29e72988780740fbf425e905 SHA-1: 63afab70d9de539bdd1c38ee7af1c08341528fb7 SHA-256: 9d24e6655136bfc7f2408d1a1688d94ff50d9c0324839a194088b819b1b91512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=anatomy+for+the+artist+sarah+simblet+pdf+free+download PDF link annotation
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kugubunekizadup.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/50703910175.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vagaduwunorijizuxita.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/74304376641.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613096718394b---badolenaxujukog.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/28473aa653ccb1a723a477e9739b8b23/gajozukobu.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/62504514024.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/bokubuzizekizelewiwetimug.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210920152544.pdfIn PDF document text
    • https://value.ae/userfiles/file/zekexaga.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/38989457582.pdfIn PDF document text
    • http://holzweiss.at/99051091643.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/41222957464.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/losik.pdfIn PDF document text
    • http://klenderbio.com/upload/files/14289807863.pdfIn PDF document text
    • http://aven.su/userfiles/file/vibowexunolup.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/wafasegopugulilevesada.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/31649458063.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/91715840294.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/42054556278.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/jovonesajuralapekagoj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ca9ae87b8c0bc2de808178c08eb647b7/vovixomu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/vuzonijivoruf.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/95827585676.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.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_off0000b440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB440 11084 bytes
SHA-256: d801a03d1ac7607959c7d85c9bee61f2c48acce449825be0948a25c0ea6c233e
font_01_sfnt_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 16160 bytes
SHA-256: ace51c699fd7459d15753b77732dd5359fb9114d282ab47e5c1f0f4a25055d85
font_02_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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