Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a778e217bfe484…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 09:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7455920bf2293360ed798f2a5ebac075 SHA-1: 52504340f67bffbebab920c59a0f0480f1e20d8a SHA-256: b4a778e217bfe4841d8308096073493609c222adcc4cbac08d638a4f8fbbb6e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://joyear.com/ckfinder/userfiles/files/nunumijiduzezarodiweduw.pdf In PDF document text
    • http://vo23.ru/upload/file/46498212878.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/60873875409.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127402d7d391---30016127046.pdfIn PDF document text
    • https://invest.pl/userfiles/file/63149180727.pdfIn PDF document text
    • http://besteva.com/upload/files/30214403601.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e416771d---lokidapixanibaziru.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c168bf7f---46222588292.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba83b4d0a---todisenodiz.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/jalajaw.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/af46828328c5f0c8d8180317d28819e7/23593873260.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/51mhgjn3eirm2v0ehqeev919hl/85620612211.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee8f2d1a0---78653357312.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4dad388d---pogamobowexenarepotibino.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tizovinojilanitujum.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/56745553427.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/xirisiveluz.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/56084578094.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff74ca353---16942129464.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606feea43f461---96956172373.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-19/20210519070058716863.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f2180cc8---kubojujomuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=walid+shoebat+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_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 17548 bytes
SHA-256: 7ad52f5d79ddd2abb9a76aea26979364ff3a84ce0cdf2da11f1f7c7c779753be
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 10524 bytes
SHA-256: 1d244376ddf41c376b56dc27e3db5fe8ea869f0f0351fc9b2ce9cac93ef0d28d

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