Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cfb0367ac79af0…

MALICIOUS

PDF

175.8 KB Created: 2021-08-04 22:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 746172174dd0efa1ba41e6e3bba1ac41 SHA-1: 216f81a38fc9aa713eee500e8cee578fad71b5dc SHA-256: 74cfb0367ac79af0abceff9787dd5d3d4ba0f2ba6242225999a3e673f81813db
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080655a83727---sirozibidejaw.pdf In PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/bekorinilodunegena.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/63ca26485a871cb13052438fc1655c57/83497549103.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/vojepemonabotinogopase.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5o4ghamr2gnmcovtpkemtq9694/fizuvepinimuremub.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd459f9435c---83066047403.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/mogokezusamufimabesised.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/68ad4afd8311b0ed1cdb73c5bdf213c5/71767879546.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/284cc0f658dc16b4598721d778962dc9/56050367775.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46982573865.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/27710854729.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/busupunugam.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c70fa67cbfbd8690d2cf4816a085b4bd/tubakamori.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/64435091509.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/89562958427.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/11296819582.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cc474bfa---geditutomuterofiwab.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608392819288e---37660324635.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jabijopifatigufabo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4273f9d6e06fe287eaff3380e9627dae/mularubejabewum.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gt8al9fvt7g39loqft13hica73/wapege.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/14e6081791096b3fc199629a8eecbf2b/63213903588.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b7f3d5b7---fevitinawa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5aa866cef---99306035166.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/vanelinefabenux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2020+nec+code+book+pdf+download+redditPDF 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_off0002468b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2468B 10908 bytes
SHA-256: 23b857d53e8e98040122a1056153c54e36479848f463a445141784a9728840eb
font_01_sfnt_off00025fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FBE 21556 bytes
SHA-256: 929e68c4ecafc87f794415d5c4d6a6b15d9fb6b41962ea7276c96dcfc75e932c
font_02_sfnt_off0002982d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2982D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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