Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caf21caa8869362…

MALICIOUS

PDF

91.8 KB Created: 2021-07-23 16:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e9de5049e0ba75e45a68fb9bfaa757f SHA-1: 27532b0975074caa712dea4f8ad490ee8adbbbe6 SHA-256: 4caf21caa8869362b4e0acb33c28f3b9a001b4f591db4f8e042cccd84d775b07
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'Remote-support tool lure' heuristic suggests the document's purpose is to trick the user into installing or running remote access software. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a phishing or social engineering attack vector. No scripts were extracted, but the document's structure and embedded links point towards a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://gamasteel.net/userfiles/file/94811327108.pdf In PDF document text
    • https://latrinquette.com/upload/editor/file/67350901373.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e38aed597ed25d1f772b86ef7e0080cf/zukabuzumowigunovaxe.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1b6f996c0e408ff7d7c36e7e7a24a341/33287803523.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8d39ac8e---31038594050.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/suzufugerakajomona.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160db31a633415---loxenogoxu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c1c48dcad741751af07731f4390d360b/65650928219.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/68058891448.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5fbed2ada80db9921729f38953028efa/wogumusonevagezigix.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d285358e8f2---4970110617.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a75c17aff---28367343163.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0br07bqsvb9rks6kc020pqheg2/wuforowudagutupalijo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d88ed263---muvizipalivafipokexo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jawosorejuti.pdfIn PDF document text
    • http://yejida.com/userfiles/file/lafat.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717bf192c75---xulup.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff497dfa52---54561011928.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k8s2qlo9if245f5ek5tjob9sn8/10533331989.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a694bf6066b---66280451262.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zerovalet.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8lbaccp6gsni676iudqo6b4j6n/tutigedekuseboxizerivuxe.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/bonilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ghost+win+7+32bit+%C4%91a+c%E1%BA%A5u+h%C3%ACnh+full+softPDF 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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 29520 bytes
SHA-256: cd502050549f0390329fe375774373ca70f26f7be17086f0133c6c183fb3cd6e
font_02_sfnt_off000144c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C8 11340 bytes
SHA-256: 9cfa40b9f0831bd47ae1210fb11339177625c688c70641dbd7ed7d0f4bfb2fe3

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