Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6b0c68f6aa5cbb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 14:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4f268430f51ff18739c6ea05180ff14 SHA-1: 4ab6c53484c0c5e551e89ed3f5a8cf8a647816d3 SHA-256: 5a6b0c68f6aa5cbb18b51a73017aed02fd9884cef0b78a7cc1027b39facf7f96
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vdtriv2pikv1o47g79c559588p/ragufasew.pdf In PDF document text
    • https://mimpishiodua.com/contents//files/lutefisobarazovokexemapow.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/403d617b1fcb03fc0bbdc814d2f2ddd9/fabijava.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/99a8668fa90360bef036f4db4af886fd/dazowafuj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/muzofiratidofusegobesad.pdfIn PDF document text
    • https://heyratacademy.ir/file/46697088918.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/852fe6c4b404d6af2b89a317440bbb0d/54034850415.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2aaf85fbf46ff1975f3113fc376db433/82166019979.pdfIn PDF document text
    • https://fuoriscena.eu/file/49254215254.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad7482a1f---41589717560.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b6fa68eb1d71513c1868a6b0bec58e34/69968434034.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ed8a10e6---pezetaresekizajikupogepe.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e632872011---dekavuwugorobasi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/62979478196.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddfdf2c2a---83268235821.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210808002139825.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/24535962928.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zokato.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/19645647783.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/50092b53707f2bbce22bfa1cbc695797/kutopivuvon.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0370c18f5---96912830315.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/49839629474.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/36340398016.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/kavivoxoridad.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6ov3lrhkf5j0tg11f483faoj5/panafivar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=xfer+serum+manual+pdf+downloadPDF 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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 14936 bytes
SHA-256: c2f90ccde662606e3e88d92df7a3182ab752577e03ca7566237447557d701712
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 10664 bytes
SHA-256: fc9fb100d47ef5c6fce68c0784444a94986db3730aa027989a9d84a37e862417