Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d5cb73ea0ccd57…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 12:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 71164250f4bafa3732149338f23a32ed SHA-1: f7aa51d18b5bc9ef98bf3eb6910f5bda7e1dbe56 SHA-256: a4d5cb73ea0ccd57b7b5e532d8d43eabdabfb516cf9b4d41191d46625ed616a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=racing+fever+moto+mod+hack PDF link annotation
    • http://6nergy.fr/6nergy/sites/default/user/file/93831736430.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e962e1bf5---temipivigadatalesodana.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bojesowug.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73787045666.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e592813f28---tamifipedezaneluxipalali.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/615581798.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b21c1b87---lunixowataxusugo.pdfIn PDF document text
    • http://bakoca.hu/files/file/41185442597.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/82913745599.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/3265619653.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac7c903c6---55781146575.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/gebufiwasadawag.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/41336897766.pdfIn PDF document text
    • http://coumert.com/images/file/vezevofabenego.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/zamupi.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/93149676777.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/de89ce4526e964f6c2a7b79f7846b0b8/zurobegakexewitizixowi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/mavinekeza.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a9c535ddf1b3d0d8ba3d05efd97cacd5/zofubaka.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/25362305581.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/14343980168.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109041320315642.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/goxedunajinepala.pdfIn PDF document text
    • http://gewald.ru/content/Files/fupajukapegaviduvemoza.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/38604125890.pdfIn PDF document text
    • 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 17540 bytes
SHA-256: af109b4c8a12b56fd66d3ba71b9348ac4a79a81f3c28e1c6026c308e52df005e
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10912 bytes
SHA-256: 9a2681722d931276c4df469d32f20a51ca5bbf9a0854ea84ac60eb62cb564a51
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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