Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b160d64805bc25…

MALICIOUS

PDF

98.0 KB Created: 2021-08-21 20:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee90ddbbca3803453695834c6b2b7550 SHA-1: 1f151e6a7262daceb5548fc73d7f69dc93aa83b0 SHA-256: 47b160d64805bc25c199d1ebf5534837eba5fe4e6da899a6cfd5ef74cd745e27
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e50385ba---gapem.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160872f8e25565---latepim.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gejanekotu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b339d72e247---felujos.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c521c09b1---52836890736.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/33159199817.pdfIn PDF document text
    • https://belloverde.net/emailer/file/lakojowonujuma.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rgh15v8sl64p6ekee4urv8tl8b/remoburirimimelabagowu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/vatelidutufibazuzusasodi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108190533091169.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/fubijafulorabovifowu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rma20ajsinte0uthhfagedn6g2/regojizudoxinalak.pdfIn PDF document text
    • https://toocapen.com/files/90993944737.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/16881756016.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab809f35577---dopubironekezigabawekab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a54bf998---purisu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b167aac5ab6---geduselusek.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b9585dd2---82152327197.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/03afac08735ebea5aac91e9de5ec2db6/xuzekenurusonifategomi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bixufubazagu.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tilegemevorigenisatabaga.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/99850681020.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/57791825420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=libro+una+teoria+sobre+la+motivacion+humana+abraham+maslow+pdfPDF 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_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 11236 bytes
SHA-256: f2a578b2d1bbf83124a365ed948927f3dfac515c12d5713ed824ae60142fe409
font_02_sfnt_off000147a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A2 19032 bytes
SHA-256: 72b28aa8cf9f22260510c53043caf4cb676fd0638d61aee57449254649bf8eab