Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea854e0f9697d8d8…

MALICIOUS

PDF

100.4 KB Created: 2021-08-15 07:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6079f72fbc14487bbe6c73b7ceb78afa SHA-1: 8a655b4eea7a3f4db466f126eaeb6029d86fec2c SHA-256: ea854e0f9697d8d867e82b033277b3ebc299fef6109e955629b306a7a3a23853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105558655371---83503623054.pdf In PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/95953142974.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/64811878534.pdfIn PDF document text
    • http://crm333.com/documentos/file/zefexuzatabarotuxisugesu.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vadamesebasebaw.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096720cc3af6---razorobitu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a3cd3eb5c259f12f23649a904b61412/40746289363.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867c125fc5---zipigetukumut.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f748ef3a---fozulolijanemokub.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/domuzes.pdfIn PDF document text
    • http://ailizia.com/userfiles/xodebilirejebixubolugopa.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/binizibafogeremijetosi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112eca06f536---baritonasovuxamajuk.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd613485fb---17485868691.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/65507804700.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/19054296728.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/90393876661.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/tagituperuzetusegusune.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/53259993551.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/nitofunirub.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gekevemerelokuladinibafe.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/mamarexoxewiraxoviviji.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xuxojoragafokex.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/05853f779f59bd9edae68fa9877cd727/6043269467.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f983f4d92c---36306375642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dewalt+compact+table+saw+stand+assemblyPDF 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_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 19844 bytes
SHA-256: 3bad0dc3fdd614ee032a5bad73f5217bb33ec1e5670d9d54c62a2bc16b587f35
font_02_sfnt_off000169c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C4 10824 bytes
SHA-256: a7dd91f02ff64341cfce4833fce7642f424a2953a9cba877c67e297a2ec87a7c

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