Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1db04c27da58ba2…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 05:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65233382cad2627c1554ecc782981591 SHA-1: 08057c71aee8b89f21404807b4da89b8eb0be506 SHA-256: f1db04c27da58ba2ad42ec092ff69c33195976840a6abda91db1f371976445c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to redirect users. 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 http://aygroupmuh.com/image/files/53975270893.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/80ff2490cc99c123e40dafee96ad2e8f/54604373495.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/saxen.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f85367fa70645d71ea7e89d40be4ffeb/61670384706.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210731062620_1645799211.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/27637260791.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/24723311480.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce8bb5fce2---xufamevewutaguxo.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/2929600980.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4473d0073---9918368068.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4708b97aaa---pariro.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6a1766e0a2bfeba409a7cdd076352210/xunosadupibi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a0sgj6okqm0pihsrqbkljugvav/virivipemozafenazasebu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607156b03955a---76592882500.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/049adb7c53eac297ff1172fd2a4d424b/89195735609.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608295a97d507---sibagigixometibisezefubu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a9bdfe8b61142c3d89a6ac5e6fdbe073/1129318916.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c66b2c697---42143370460.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6f5a046---xerolozav.pdfIn PDF document text
    • https://vestol.bg/files/file/vexojagasobowuvo.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/28464362123.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f26b779f9ec4f646e2a60a6b83d2da62/87591262028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pneumatic+punching+machine+project+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_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 18656 bytes
SHA-256: 051c25303d4d6d55df972a6712ed17c3418306e832544d8fdd0aea0fc79c35f5
font_01_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6B 11084 bytes
SHA-256: c7ceeac4f6fec7e3d23c69c3c526b6d0153ff1013151901b600301a9953902a4

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