Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731b6859aa979e3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 05:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 024b0f97712403564c9fc7b79982dfb3 SHA-1: bbf4f94fa3582560f9be828cc7d823129cb13bf6 SHA-256: 1731b6859aa979e3bf1a4eacc7e00c0d7936ea1756db1acb9e6279cc4f4ab820
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely serving as a lure to a malicious site or a phishing page.

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://cructi.ru/uplcv?utm_term=world+football+game+apk PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/67693306286.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92496004612.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/kubosofogamokuxisuvepovub.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1de6d466acaad9f5ede6f52a03ac565e/litakamalixo.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wowiru.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/52297377182.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/23495548805.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/pojitekijojefe.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/68584923699.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/89130629703.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/gefuxumevuken.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/tobikupitoruxiwilux.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca6c499c4---pugaxesisa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8004bc8ff---70441215904.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/373ea120496acd155efe0a02bfc3ff20/bibujugoxube.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/71657781085.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132745e700c1---18730591956.pdfIn PDF document text
    • http://gekon.net/userfiles/file/21120241827.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///50230544757.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/35856350042.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e628fd22919a897720ea4adb2ead5e96/sifido.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/90963182798.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/bajuzobulujawirelalu.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/buzilon.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401837cec50---semenuteb.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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 17360 bytes
SHA-256: d1fa00280592d9aaca4e3885647f899d14dfed90a88d66dd0fd0db76819fd2ce
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10704 bytes
SHA-256: 71a35d66dd3d7c75f3764e874413b681535cb439319d03a7dfd14953537f02b1