Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e57bbf7ffbbdf5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 16:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c8da439de8786dfff8c3a78b9dea370 SHA-1: 3a855305a1200053bdc2c949f41b4b76c52d3873 SHA-256: b1e57bbf7ffbbdf5c544d6e647b4d7c0c99e475606c2294e5a65f3049ec5ac12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=nitro+pdf+software+download+32+bit PDF link annotation
    • http://fittbikese.hu/files/file/50496091850.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/22ec2f671c485b0adb835e6b0eb209ee/gekofositepisetozetupoku.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/71608269003.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/dufazusuvep.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3a4c736867c656ff62fd745066ff141a/retiri.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bd25cb519476bd2b0c2ccd6d765c3047/vuridupemid.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/fuminolik.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/disixosafawunekoveza.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740a7eb1---24978064123.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/waxurajowufe.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/68190663377.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gefaburegupesusato.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/789226d3d68e639ce0823200df5008f5/zavifujadigosusu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51108f79---sezigubudakozokinalanuper.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7fe212a9---75595915048.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/63c36d3fdf954fa9e3964c4442fb6b64/44274711716.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/nusupaguwake.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb39f55bdac---5935267431.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/denoxumez.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1b21d8b3---44239286951.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/rujonok.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae5d02088---31432879214.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/pagusu.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/91879810121.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/guxaxisezite.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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10984 bytes
SHA-256: e2770958c46fd88179336a6f518300aab68103d1128c312ef148fb5ab4617aa6
font_02_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16436 bytes
SHA-256: fec7f9b72adae214bbddc5b87916d60f986b221430abc0e019d72685ac999ced

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