Malicious PDF — malware analysis report

Static analysis result for SHA-256 305e9db878e8c7b9…

MALICIOUS

PDF

82.3 KB Created: 2021-06-10 13:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd0fcb41ca50d085221c092fc4268e74 SHA-1: f6c400e2cbdd04e8983420afd4b8481cc03ce350 SHA-256: 305e9db878e8c7b91360d26edbc5afdb1258d6fbc7abaf0e526ede51aad6372e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=full+body+strength+workout+for+beginners PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/busabamuzuxafexovene.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7662e3cb---tepov.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a642191a---28463588856.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/biwizabibes.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb6abc1cd8d56e6680d368a75499ca67/xenimevudolukiseguriziwi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rurixifenapifumawesu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/8a2siqfhmapt2bcmer0h2ohnip/zamesojopegov.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d7780b55---zitutofokuvafolakakuv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffa755bca---63258939867.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7he7s3rfm4k764dbsuqjq0gbr5/vofukobakemojedomowisar.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/kududunaxolamev.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c5fe09f78---87056342842.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/15425881532.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/57802a9068fc17d7692a4972de8e1023/linilelororavifej.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33c9969d6---71693771019.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2e60ec1a---budonazigutimaboxogexir.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pixonaxebozetevekape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 5312 bytes
SHA-256: b7f244581e40daa74f93a09c2581e6f178750babeab1db26d4b4f0ee3591d24f
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10920 bytes
SHA-256: fb4fc24b57ceadc5b2d8eb6ab1d2ef79fd7aeda9ebedf351cdd6ee30a284560c