Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd6d72094284d6b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 04:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 285bd2b24f480608d01646b9ed9d0f76 SHA-1: eb6608d39c2a6c3bb18edc1ba7b37308dc45e811 SHA-256: 2fd6d72094284d6b7e780f44de0d78252cfd3c8d370d3855e9e92d3e625bcfb0
184 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous links pointing to potentially malicious PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://vitanova-cattery.com/upload/file/gosivolidurowovuf.pdf In PDF document text
    • http://malifer.hu/upload/file/27735764594.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nalmctomdlens0j1hdtk01r6tf/sozowipulukowilakide.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/44879059179.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/menov.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/75670879160.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/xelemibagenujakenugaja.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/51573170273.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nagat.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/nokavizigapagiboxize.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/45650418198.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mofolerewubedi.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/vivipufiloteveruwoxe.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/22120621990.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/wilusekuzi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/livotexatakow.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a6571b73e2981e752b07a5a0dbabc064/52482466577.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/60147223484.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tuzaxidakufe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6549e3cbf---5901001180.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/12609264024.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f45f32fd4---tuzubonobepovod.pdfIn PDF document text
    • http://gnox.vn/upload/files/vojuwifenilepilaxan.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613249b29b9a6---luzed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=import+contact+vcf+to+androidPDF 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10452 bytes
SHA-256: 06ee064c64dc8ab7ce1c7e4c43be30a3c197cc25ddcca6e1a99a01ecbc8593a7
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 17736 bytes
SHA-256: 3ccce72aca4469c91d6ad97d1a9772798f3e65112f3f4ca654001f9085448211
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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