Malicious PDF — malware analysis report

Static analysis result for SHA-256 364ed27d1b01864b…

MALICIOUS

PDF

80.2 KB Created: 2021-08-25 20:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b984f0349719ea84bb4618af87a47672 SHA-1: 4086186feeeee6fce70b13a18025227660dcb5c2 SHA-256: 364ed27d1b01864bff74d30f30117479e12602f5764550a54a01825b175fe0b1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sfera-vlad.ru/img/file/jidilijosoroxetuduluraxu.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b2f320bb8d2---50155522137.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7c379cca0e4344269f1d1c49d06ce613/lolokomagijixiborumebova.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/luvebavivasimuk.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/32019922943.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8da338176495df30b2743f707757da6b/15287540133.pdfIn PDF document text
    • http://dnepropress.net/files/file/fiburufiranafesexop.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2162341f6---20996517401.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/99453756214.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc28820d7---22187975905.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/kixenimibabexetixob.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/18525604085.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/40897656264.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/2809896145.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46a35fc37---tewesowusawagupakereme.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/22386487943.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/295be0c5f6fe1b66d1fe97a3ce8a489f/82361922746.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479c447340---74687735684.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb714d262---werokagalapifujatuzikin.pdfIn PDF document text
    • http://ttc-investco.com/img/files/soporezedokimusure.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/11372764621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=php+deserialization+onlinePDF link annotation
    • 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 10552 bytes
SHA-256: 8d93fb592d5718ed5a0dcd657bdce84d42ec7a8b71370cc5e4cee0d5ddacfe9c
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16776 bytes
SHA-256: 20ffcfd8598ac66b1c6d9e77e9aadbb469421b64cb603f00e3a1831b761da246
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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