Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63ee06c0f3bb1a1…

MALICIOUS

PDF

128.6 KB Created: 2021-06-26 21:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e663123a3e60453963466ea2bf5c650d SHA-1: 7249d422a63c63d15da17cdce51fac1cfa8fa70e SHA-256: d63ee06c0f3bb1a14d502aa6cb4146103a5183531e68fd5942ac3825546bed96
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://wastran.ru/uplcv?utm_term=most+popular+theatre+plays PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bef66918422---83308020673.pdfIn PDF document text
    • http://laduses.nl/image/file/84425850070.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b73ae7854---nukugusukojimab.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb921a5f8---voramopafurajadojufibaba.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wodudajiwutajipan.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r5sf750kes2uq9lemn4f1t2285/jekoforosumixovuvanular.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/53567894922.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/104g5ila3v3jv6c41ql86q8bea/27710723015.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/2nv6tor2tcvrc4gdh2qqhk0dd8/vazav.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5e57e66781562251e8be544d66e41f1a/14440337947.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a69d47cb0---41992474178.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/8749837107.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fopitupezavivawe.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nokegejizejetem.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/jotolasodexitiletu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e103682ed34bd5fd39b3514d5862b11a/97237319413.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/069fda30e32717f8e6a602f6c8d03c4e/welusa.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/38948805183.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/itjmr03p8l412gkm0ubfk6nmih/67864745497.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kezuresefadidisalo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160844dd335717---1749132319.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/bijepomaxikopisiditoga.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jologusos.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51430881793.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_off000197c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C6 17496 bytes
SHA-256: 3359423fc8439288f1e2599373c7b13fa2550422089d90635d8b576baa7b0c3f
font_01_sfnt_off0001c5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDD7 10360 bytes
SHA-256: 5cedede4da7bffde3637ac8af0b1f4be02ef56f0d3bcec57b7dfe30d898a3da4

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