Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3ae569dc32689b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 00:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5769e8dc4cd848b962c90c3bb161384 SHA-1: e17beda89aa418481206be4c1cbf4fe6bb6c6a8b SHA-256: 7a3ae569dc32689bafcc28bf81715a1ad6567317047bf457ae30490a6a67e3d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=alexa+third+eye+app PDF link annotation
    • https://emotionalgift.com/ckfinder/userfiles/files/9920885805.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/59221586402.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/dubetuguriwedugawesike.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kiweseremipejomudavuk.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/wajubewelolim.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/90797838849.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/bomevirapaf.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/15029041738.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/56687461665.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a5c3015---15819399111.pdfIn PDF document text
    • https://quizai.com/uploads/files/fokuxa.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/15530130649.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/934454887.pdfIn PDF document text
    • https://12waktu.com/contents/files/rusuvegawizilazixozeparej.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614090c8ec2d0---39999019452.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zerajapirudeni.pdfIn PDF document text
    • http://haai.org/upload/file/57162495075.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9499ela053qavmhhhk873u1k89/66336381141.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/kafilapetemiwikif.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/73447771377.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613236adae6a0---gojumubap.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/2194223125.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/96637623736.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/69190745318.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10296 bytes
SHA-256: 68a3f167e2cdd0a9d86a0a0b12b24ac35335e06ec034cfd0fd2e9ef4019acc6d
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 18916 bytes
SHA-256: 730c09d4a15aecff4625dea15c1b5513f90e565e287356928708f3705af9297a
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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