Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0245752f7855db…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 764591befd3cd1a56a9f156a43b21fe3 SHA-1: 68e56c4cea46df96948471a05a7fd242e9c53622 SHA-256: 3b0245752f7855db73dd6c09b3400b00fb6e6828d2aab365aed8fe126232ef50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a significant number of embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. These links likely lead to phishing pages or malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=the+fall+of+the+roman+empire+heather+pdf PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c49b4f775---lakurazijox.pdfIn PDF document text
    • https://funbugs.ie/files/file/73449445516.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/bugutorurazofotu.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/93947120394.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086413a1d774---30435787617.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/30282053653.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/87584621649.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/40926419063.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7200e75aab4e88007d223d3efb38c368/navipejuwurojaf.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57939404316.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/cdb5c71b42d78d714ffe90c40a25b6bc/60638306519.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ed06aa83a---nusoj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f2f020294d16986b96d365015286ff35/merabuzatilur.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/686bbad9cd3d0495300c5a61fcf60ad1/15165989254.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dfd3f995---61210254855.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210713225927_zmbtfv.pdfIn PDF document text
    • http://airsoft1.ro/files/file/tovederusori.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/af02791a296083b0ba8a9879b7761d97/97254380899.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c2a0421a7fd0c1570a02ade0b7c22c0f/82664939.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a64a976c887e3cab855652ab33b9138b/zuminodabil.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6bf552d0dd3d9c88ac9818ae03864962/jatoxeta.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/122035189656.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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 18336 bytes
SHA-256: f25a96d2a89a33dec056cd2b495d3ee48bda91339d2a33cfafb6461a2e3a186b
font_02_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 10560 bytes
SHA-256: 0b8ed16460a7d5b8b70723b9917b13c48963a2c3d63417dadff54c7f5f938a2c

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