Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b9c34b6a3e15e1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 05:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33028cb8c4ded11f0637e6aa7ae079af SHA-1: d32eccf024c1f871c6da59577064d43186ac4c1e SHA-256: 19b9c34b6a3e15e16484b5b706e8c4741d39d939dc2084ff177c7db267c9efc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://brianhigbielaw.com/UserFiles/file/turetigipejifurizaje.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838b40406a---viloru.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/lezapenosilutuzujenaku.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/teguxun.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/27629903307.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/35201220298.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kosasumedufukiporoletidu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/93122402448.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/82117427559.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sepuwukakekuxuru.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47774a49e---42649294799.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/tetofavabulejejilos.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26776768456.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8cdbbe6f6119706b1cdd4b6d21c28de0/nojufufefuwaduduwotukata.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/73473789298.pdfIn PDF document text
    • https://ms02bet.com/contents/files/36494350475.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/vamujenaka.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/33369657426.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/fukaxagumabezaxok.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/sotuziki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=comment+personnaliser+son+telephone+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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 17064 bytes
SHA-256: 4b5ca539db7342fb844664540f73d1853eed82f1a52fe1c3d8136066d536ea32
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10688 bytes
SHA-256: 6d3380a8ec009d3d9da77245b5b7dd2dd0c7cd147d8ac5165c3a4c7e275e724d
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1