Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb65c7276bec39c9…

MALICIOUS

PDF

77.5 KB Created: 2021-06-29 04:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 783f926e4e68a42a6d8c88a60f9940b0 SHA-1: a7db47758149a1b6742ef95ba49e9c0bb6ecf4fe SHA-256: fb65c7276bec39c9fc7a65ba3097290789bd4e0242aa91ef7b07c9a79148c3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=business+plan+format+ppt PDF link annotation
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602205038.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/db4t8f5hleib1v7fdlcleifhpk/12216377730.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15a716312---80687549720.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607120fa5d377---bufugalebobidegukatiba.pdfIn PDF document text
    • http://fruitvita.com/files/files/93248575152.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623352257.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/36283a031608f894fe7ac76f9e5ac953/49201345857.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/csu6oubtjoq48fokided2ae5cv/wotonozomafutixagig.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a954f2f1---mopuxexagodu.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e006e70b29fa59e014a56eb725aafad4/10757995108.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7227d63d90da93a93f3bc64648cc9d1/ganedazutudofawevutukel.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/gibaxirudu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b378f4ace8d---44238654051.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/74so9r3arb62e8t67jvclmiqfo/rewel.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3ftkv3t88tb2t2jo99mg8se0bc/nosejukiwupokakixo.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/15488511850.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/pivunexevaxeg.pdfIn PDF document text
    • http://scpt.it/userfiles/files/dasilewivi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4ce1d43c278caa1b7120dc454ed02584/62065402130.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/95031654451.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/ragovigejiwizuk.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/rorinaxi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9iita41efvqn9k84ghuqoe4d1q/jelazaradebesef.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 16516 bytes
SHA-256: 1c2ccaefae2dc625085395dcf86f5940dcf9cbee7a48e9dc8b41f203b3b0dac0
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10672 bytes
SHA-256: cebb2683ace6dca38752003c90d654c1df59776b77c279d4120faac4b690b269
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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