Malicious PDF — malware analysis report

Static analysis result for SHA-256 edba4dfa0e90ffdc…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 15:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68856591d30809782c2197ebae4dad66 SHA-1: babfa5f8865ab11f71765fff0a2d4b2b05015326 SHA-256: edba4dfa0e90ffdccac36ca5fea72367f6932d014b84f55b3502ab31a7bfa965
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://villa-carlshorst.de/sites/default/files/file/42301206256.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee4e6ca61---70830274900.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911010223.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/461ca0ef9575f3d6a63980788ee5a444/kunusojuxosufixa.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/fesoxenepuzunikakezitupo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615420563179a---tofixuratilozuxu.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/32812229850.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lifudelukatemadulafafodo.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/muxotopejav.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fadabinasepifo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/duwavitud.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fdca8849---jugalajukuvixuzugudug.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/22618a0cd659b5f491156eb56513ba98/pirogenodaku.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/dugolixudabegopona.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed2c0750e---64865617599.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/40206487503.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/jopemule.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/fibametiwa.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020530291617.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/pitegipa.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/79146929002.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/botidomepewolodajen.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/pugegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=intermediate+market+leader+answer+keyPDF 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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 14548 bytes
SHA-256: c2dc91682f3f2ece3fcf09dd7205a79d24934dfa26788791c6cb2d9496796b9d
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10532 bytes
SHA-256: 55dfdf418c57abbbbc01d75a49bf84687881c6738d2197ab65e4ddd56db31d03
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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