Malicious PDF — malware analysis report

Static analysis result for SHA-256 3400af57b5e9df12…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 11:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9ac9bfe042ecdebc178aa36bb1c3fee3 SHA-1: b5716753bd577da030fd61af076f0197627bd79e SHA-256: 3400af57b5e9df12da5d98786266e7031b2f80acd9eb0be1d02ba7380eb0e1c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit user interaction through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20376acfe---35763320344.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/afa5c380fabf960f02b34a32b6128d37/74855048019.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/57890028607.pdfIn PDF document text
    • http://immopolignano.lu/images/viwobizesilanoferefader.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d6b6a157aa2b42b21c08549639497a8f/larajinuwedaraduviguw.pdfIn PDF document text
    • http://winso.tw/userfiles/file/jodawekoluzi.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/vosuxape.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/potuvuvajumisike.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/wamukebidopijuxajot.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ddb82322---zesufibajofenonadema.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/96958024375.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a495175d54e---mogogujoneregozatokamok.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lunutikitopixusezozem.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b0d6129---jetadijexotewadosegeza.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d5de246f---tiruxawenodawipimanadatir.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/20064084207.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a667dc7b611---9988773270.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/dutuziruzizizop.pdfIn PDF document text
    • https://naoshima-habitant.com/92629139624.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/2nf252vfuagtkqlnesncft9poh/62631286443.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/226084860bb871ecb3d7.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pilot+study+meaningPDF 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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10708 bytes
SHA-256: 15492d126e39c47ca1d7861aad6de787f69c1df9fcb28f8fee30a0565baae81d
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17140 bytes
SHA-256: 32fb4692902fa5a3f47f6201b1b4832a218649475f1c54eb2798d9dba7279283
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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