Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a05b12200bb4330…

MALICIOUS

PDF

84.5 KB Created: 2021-08-24 06:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 360c031fb2130f5a92f4faf2d866a33f SHA-1: 03ddca82f7b45352c409a4557232280e4d9d33e4 SHA-256: 9a05b12200bb4330d7263d779b303bceef5ce4418e089cbc097f78a87370403e
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=canon+service+manuals+download PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/90l4cjs6us0416amjkltao9oj3/43853210085.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601173032201408.pdfIn PDF document text
    • http://qca.ch/userfiles/file/79084417174.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d713d45704---wutifikijufakejigexov.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/71a0614cd71ff77505246b2d54999814/71087061276.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kufolejer.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a468a9684---xejadipa.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a779560a74e4654b44a142b9c033cdbd/47062972871.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cu6urn1pbrh510957ilkdovbhd/60079101425.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/paramiwaviguwujap.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/465b295961990d0490827ba4b7cd6ef0/todezomojojeginerazeku.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/nixilewoworixagovutonu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/41055523725.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f770a991f---37883269460.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/1653258035.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/48399233110.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/mopud.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e2a59a60edc9bb38dea70e68f1493b52/luzigimuwugexemosisi.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/10339306657.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34d23b460a8c060b0dc701fd6bc5148a/potalasuk.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zasojadijoduxavolivura.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/43922300960.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/vonok.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-14/20210814151611385320.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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 17308 bytes
SHA-256: 446f1eb93498f2764bc1553b61ba9f501a21e2d601e50d9d3cc71c5514a62561
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 10716 bytes
SHA-256: d151bb79e5d930885171a4736507cadd29041c1bf8ec44a40e53e22ef7479a2f
font_02_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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