Malicious PDF — malware analysis report

Static analysis result for SHA-256 2347e4b2dd5b6cb2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 16:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbae370c5563abb5c3c65a831713667d SHA-1: aa3fdef6b6dcffe0401eb38e43e0673cf5099483 SHA-256: 2347e4b2dd5b6cb23d3c68764035e4f5db8cc81bd7b18a4159aac4f514570490
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to deliver a second-stage payload. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly suggest a social engineering tactic to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://thementalhealthadvocates.org/files/userfiles/file/30789504372.pdf In PDF document text
    • http://secohthailand.com/file_media/file_image/file/kunagusemibaxinidej.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6562413b1d08e55c84d620a13a041804/411942821.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfebc1dd34---jiferegitojubaloleg.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/viqt7qdicmp814pj05pnq3c4n0/3479401412.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bf51e3a9f97e467f6dde8ce5eeb568d6/52136930330.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/sireligipetoxu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bepobulipovonosoti.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16111100b69add---15890247417.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/gizepexogapirofoxedowot.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/riijq12miltth6ak90td1osrbr/buvukedujiluzaruwulel.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/22968581488.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ced470e4---pitim.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/rokoxejujelafu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b802b002---17487975546.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/22246334918.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6310138360---mivilodazenudafonafokaxet.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/14047218605.pdfIn PDF document text
    • https://digireg.com/upload/58042592053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=s+corp+shareholder+basis+worksheetPDF 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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 17520 bytes
SHA-256: 2d0578bfe60635c884e310d7232f512a875e93d1642cdfb1e5d1965a99894bfa
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10900 bytes
SHA-256: a5f1108a0fe327e276c8b64df5d1e752622a46b17c956c4e86d1c00d427e8d9c
font_02_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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