Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa35c472b47df08…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32223879d5206f981ec60cefd2b92022 SHA-1: 96509ad7208880e7e9e696f8885cf1d312fe1d5a SHA-256: bfa35c472b47df08db7241c4d334502275e4c46368ab2193042b006a04dec027
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=cricket+magazine+pdf+free+download PDF link annotation
    • http://satakantaresort.com/user_img/files/dezozopejedefusurikes.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/58478683044.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dobikobozeveduzorajejodud.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613dac966---jakisopulo.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/tadivumufomapikowuterad.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wefizusuwiwulozuzepevavur.pdfIn PDF document text
    • https://irrisyst.eu/files/file/nakuxukikofobosuf.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dd4ad2540cf6fa6c432f9cd4dd74f55/divefamuwilemosot.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/doderineligaseguwijigop.pdfIn PDF document text
    • https://dintek.eu/uploads/file/31263309363.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/66371785508.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909070651.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136340290494---fudebivowuwisedebu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/96786299049.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/58509955997.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161307b7b5a727---58290649818.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909071716974.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/28161533027.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fejexalilowekadopiza.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/24286437759.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6a7064d8---rewuxelokusegozifelaxit.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/83261899189.pdfIn PDF document text
    • http://short-story.ru/upload/file/46652392968.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/nivubekomaxipodo.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/mogafajodokukemujanisori.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_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 11064 bytes
SHA-256: e9b5296adc1b7e50f9d3d2b8c4f225905051c00497f8d014e2cfc54a9ed63cb9
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 17720 bytes
SHA-256: 641e77b7861101470c232314bab92e6f642d0eec1e83fc54ab9a1bebff50b8b9

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