Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fc0b8b4ab4c6fe…

MALICIOUS

PDF

92.3 KB Created: 2021-08-06 21:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d24144850b03dc0ecedd92b7ebf1eb7 SHA-1: 50cdcdd4fd645c94ec4d5e7ed13a8a835beee06d SHA-256: 94fc0b8b4ab4c6fef8c5b813c248ec989ae3abe7535544c97ef479cbd95b5ae1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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=norton+anthology+of+latino+literature+pdf PDF link annotation
    • https://congchungnguyenlieu.com/uploads/files/28265691868.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a62d49131---fuwakar.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce51843d44---48158753312.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/xubuwifatuja.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/palefoxojax.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d96e47da8ed89f762f563407fceca8d9/22337948392.pdfIn PDF document text
    • https://datajournonepal.org/files/40708652892.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rufama.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b51b4332e---karop.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8f93c519---pitumevani.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ee3daff3862a57cdd2a6e5983e7988fb/8565461508.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fff2a5b2---52111396651.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7orll1h3s4caniscvrpeh9fvg7/fojigak.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/fofopebuf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ca15978b---biwizowume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7a201562---soxejakovujolur.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/numuxugemasevu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7ac71bf---71324656472.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pidowelom.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/javujafobag.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b936a799---tovasovupafasoti.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adbca05009e---64076418658.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/aa66769d0c85331e94f6bc21487e29be/nopej.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/muburapanukesuvapigibu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/lexebesozagukataka.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_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17832 bytes
SHA-256: 98bbc72e62ef6211760325b6cad96314ffdc2279b0aacd51e4636fbd7275815d
font_01_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 10800 bytes
SHA-256: ed3ce65fb72aeefd89c165fa782a890153e049f3ef6c377a890950b7aa2a29b1
font_02_sfnt_off00014bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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