Malicious PDF — malware analysis report

Static analysis result for SHA-256 6317498d68d3e1f7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 20:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b20a5bf484bf5edda1a76ea3a813a2c SHA-1: f05478db4afd3be3fcd3b738402b01b761581bf3 SHA-256: 6317498d68d3e1f71d7c6cc0cf30fdfa21e87908fa5b14d09e458ab554fdb4cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/39821589264.pdf In PDF document text
    • https://service-panev.com/userfiles/91484984731.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074169508953---37590581832.pdfIn PDF document text
    • http://erdbau-rauch.at/40115155534.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jijanaxajelixogidop.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xotenevedexipalusitupo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4d520945733eff59eed33049bc519bf2/59315644466.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/5e2980786fae677c65c6262d41ef7121/jaxavonomuwebe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608826a1108f0---jenefumovaradezufulosa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/49353f0b0c16d5eb565bf2360da30d7c/49413210070.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37c924787---lebubapubuw.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/50102349970.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f758d0c02c---2993173658.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/24280247835.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/lamofaporebudimupufobufor.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bebametupamaluwakenamaxi.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/ripanupokapuzuxo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vufefijiwaguroxaxapuleg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8c6110b5---zusuvuson.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c6b27b210---padadatu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/nurapekitivivefona.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/63910926883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ley+de+los+signos+pdfPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 17384 bytes
SHA-256: 10ceb435b0219c52940e4acf987272d9fa14f49addb177c634186de936e402c3
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 10384 bytes
SHA-256: 20421f0ca1723f3da3690ef059784ff90ee63b32626b0d65db344bb9889c0985
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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