Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4fa6eb68fe05f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a34131df725fc3ff916deea6f25df7df SHA-1: 150b46c2dac95057ec13c68d241c7f479cba4041 SHA-256: ca4fa6eb68fe05f0fdc8758891e55ddf9014e4e417c7c676efd6bb927a68a2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=careful+how+you+go+watch+online+free', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=careful+how+you+go+watch+online+free PDF link annotation
    • https://serpavenger.com/ckfinder/userfiles/files/15366951752.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/63830734645.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41876665822.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/80499050049.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e884005---gipelode.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/sujobikumuxa.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/81598746524.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c4ca7317a808ed44695f1c83f85de3e1/kadajalavamevo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sukolabimuxusodenef.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/powavaragenasutezupoxali.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090430079288.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/47084151917.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/zujazogezumugam.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7453eb66---kufikimu.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/917386805.pdfIn PDF document text
    • https://panama4d.com/contents/files/59960292723.pdfIn PDF document text
    • http://metallpress.ru/files/getudiwupijikovip.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191225611874.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/fopoboxax.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f621269e7f---79398256360.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fulivutuzodesolel.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wigodamogitutodotodu.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/41252278007.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wijororuvosetokopamox.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecaf8b0e224f2b66afa37c96ee6ee70d/romonujajiruzor.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/bobibiki.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10780 bytes
SHA-256: 74d82be431db99f13e1da5c34a2ed7f545596aab8f4d20e517147dd97ff76adc
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645

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