Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fe26035ab41c42…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e9d465fd25e0b373106dcf85b4a745b SHA-1: e866b566c9eae345e5607f16e9cdf26a8381f4ea SHA-256: 23fe26035ab41c420db6408066578c1bbd9186a7e864b79acabbee1334ba6ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • 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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/758c94f4c4dfcf89a48776eda7b772f9/72358696016.pdf In PDF document text
    • http://agro-vostok.ru/userfiles/file/womijevefaja.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/sopururubelo.pdfIn PDF document text
    • https://siroyensao.com/upload/files/65779584377.pdfIn PDF document text
    • http://deltools.com/userfiles/file/95541332654.pdfIn PDF document text
    • https://aokman-drive.com/d/files/34719622453.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16078f59d8ef0c---88288181568.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609683cc5f6f5---kudani.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/vilirogopatemixopoxu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/32682427593.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/bfdb223c579e777fd62017769845a080/pipamosafuxomumemev.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/tukoratinadib.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607084280542f---zifabavofazaxikevela.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a7b84c87ce7e7a033951aa04e6c3129b/mazufarupozodatam.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d6a2dff1---vixitez.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/87694270486.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210816042522.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6b9b4a69c1517680bd0f0f2f993e3865/davugewijejurij.pdfIn PDF document text
    • http://arablift.net/userfiles/file/mejogozuxilotuledezu.pdfIn PDF document text
    • http://badgerhillfarm.uk/rajugobipewagosuw.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/poviguzofipiputuba.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3202201915f8f55f35ef5e1d7888e39/dubir.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nabofebugibax.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/68116064568.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b02df84f---zelilubuwibege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=jazz+toni+morrison+pdf+espa%C3%B1olPDF 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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 10916 bytes
SHA-256: 046d219f75c75b23345cd049dbbf52d2650cf985ef9da7c8adf22445e22ed33a
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 18392 bytes
SHA-256: 61a385191391a5c6e2e99ed2f03f0210f3347820eb23d7040928aa92d8f44cf2
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1