Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef078413e78a61b0…

MALICIOUS

PDF

110.4 KB Created: 2021-06-26 05:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d6d5f3172c656482f1f75a9a0fd25fb9 SHA-1: 0927f40c9a01056b78e88daa1be792c052b49845 SHA-256: ef078413e78a61b0ebd7b24418d89868ffbc01d0317874c551e15008811a9aee
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=touch+typing+tutorial+pdf PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4391cc02764fd14aa97a69718fa18157/34063346960.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/41805017579.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4985d2c5---53535204692.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191c94fe66---17568697871.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/61805189083.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a1f66b73e3d4c2193c65a149be77208/pegipisisudafixasekefa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d918536871ef7cd90556d13d5f8a2425/85101494925.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/37589735047.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///ripudo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/eb957ffde7efe39502f26f6836f6dd04/57590695317.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ctsgmn2o6l91mb279bshubs966/2310841397.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/zefitasazavobilevutefog.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3iofoprkm00f2r8ses7hng9l2/14249848739.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9fce337af47ec18f22861c8cefb592ab/zamezikuwefuvexedovi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a2631b949d931f40a2accd7dcf20e0bc/80097873829.pdfIn PDF document text
    • http://keacg.com/upload/files/36086392998.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5288b0251ba2ddd3325e950020282b8a/54188113610.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/59c20b4f3bf635e522b44c7578f5dbb9/29416645211.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/67947253117.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84dec74cd7---2492438613.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9667bb1d---seguzalamelo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37488994733.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/td1fp55vgerisq39mop9ip9511/80704657570.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1213f9364a62b06a3ab0752b33b0e87f/32935109700.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16741 10776 bytes
SHA-256: 51fef2f2769908d87d20cb5aef25463d19bba9e560dd2e5fd54780007ac4129e
font_02_sfnt_off00017fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCF 17184 bytes
SHA-256: 2de2730e06d11cf3c6179c3c6ba350e9b3f007d357e53609082e299dae89004c

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