Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d4400c9883c356…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 21:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dff59197b65d5284e748a9da38fa3624 SHA-1: 7be39967956a49e450f7a5598549d1b3a1599c3c SHA-256: d7d4400c9883c35691759ed8475245c6331bf79e4e1ae86c77a8bf27c633d26f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The embedded URLs suggest a lure for downloading content, likely leading to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=a+quiet+place+full+movie+download+in+foumovies PDF link annotation
    • http://rebeccafantarchitetto.it/userfiles/files/71252148024.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/81918530284.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/76465267644.pdfIn PDF document text
    • http://sushibelovo.ru/files/lanod.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/fakewavafinez.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gijenugineravexiwipajosed.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613913f0cc492---surezozubinimawumorov.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/09qj7u49v19k5kgcaiu0ur4ra7/giretegad.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/30836440230.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/jobogojajezizotudor.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tuforuwopowigu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lisilivuxurejiwiweto.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76261503824.pdfIn PDF document text
    • http://sakem.org/userfiles/files/49837630501.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/lotaxokipuwizuduwig.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd21d06af---53544322107.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/70857958953.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bemodadoni.pdfIn PDF document text
    • http://pinxedien.net/upload/files/vilaxemawibo.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/kumijopubemokare.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/diloxonorufarufufi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb09cee1a6---2645126640.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zuziwufoxavu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614584910b71f---75503229066.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/nituxumozokefanujizofu.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_off0000b94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94D 16328 bytes
SHA-256: 682874fe80a58b455c2b57a58782ee0932e8e6e1694d1d71c911884b4340195b
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 11060 bytes
SHA-256: c6906fe9986bf393c28ccb3a73b9dd4ce8df777862df922667a06b05460365ea
font_02_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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