Malicious PDF — malware analysis report

Static analysis result for SHA-256 794bd500a221722d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 22:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d93806898bc2328862e0bfe11d526f69 SHA-1: e5cd0145e5155ca2860970668b20a5538ee24a99 SHA-256: 794bd500a221722d0e2ec237b3f4eb040d4cdaa097f0f8f6bf13d39e2bba21a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://chcial.ru/uplcv?utm_term=oki+mc363dn+manual PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ea90558---fedufusuburexuwix.pdfIn PDF document text
    • https://5uempat.com/contents/files/lutomulanedovip.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/13199766005.pdfIn PDF document text
    • http://stromzeleny.cz/file/jizozovonowanivokel.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/riwomafe.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/91577470836.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398080ad7f---gasugar.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bulalivadipinetaf.pdfIn PDF document text
    • https://digireg.com/upload/narifitodub.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zosumajizojijujedika.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/74698228105.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a439242444bee3c77dfebd108dff1f0b/17063725708.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fipogepofunuz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae7539600---65008551668.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/gusojed.pdfIn PDF document text
    • http://cocoal.com/uploads/file/pogidositewigexawotif.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03b5d6b958---lupazoberikunodix.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wutupaduvetatizixabewuz.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/novowat.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ef2a477d---zigilikov.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc981976e0---17671881012.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/70887458993.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/jbvtsjol7h0ogt52a2fqd6ce9c/59895863972.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fa227c1af46544c3f66b9fa7fd3d1a8f/vetapadaborewokazil.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f51310dd0---11909827078.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/83899984537.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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 18392 bytes
SHA-256: d08bbb66a732b80fca264760942ca3f33574e1ce512687aff03fee49dd97dd0f
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10472 bytes
SHA-256: 9b28bfeb6538a93f6fe461efa4664e16023b2aea9b59eb4decbbc73603c18ce2

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