Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac93a07f84600bd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 14:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d0c16828aede450311fbca1d5ad54ad SHA-1: 646b70ed862fd1732f697296174b29963f5b18ae SHA-256: 9ac93a07f84600bd79fa9c745779f0b77c0f9f88afd77a8a5244546a77295a04
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=imperial+armour+-+index+forces+of+the+astra+militarum+pdf PDF link annotation
    • http://ryanoomen.nl/uploadimages/files/45202223287.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/96076786193.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/natobizipo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b57f448dd15cb59a88781b9bc67a91c2/jokexilupadofupimutuvipo.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/9096759517.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/16073577995.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c813a4413c---32377690080.pdfIn PDF document text
    • http://santeh.md/img/files/xulobumukuvo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d24314674---vujelixipokamawodomevunar.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/50151789312.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e93cfefa34---takemitemevumoj.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210519175249.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a068db9c64---gapulumikofaletaj.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/22423792892.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/95117305904.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679b65777f---1486107860.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0aece7ae93b02210d4fa0045c8b7e691/jofowelupi.pdfIn PDF document text
    • http://futboltotal.net/images/files/24176783201.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/o9sugkt4qf33qibmlk802cgl15/gavesadobudodijew.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/80396133364.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bu5s620oo1at0ik9422m4jv37h/jatujofabulidafeguba.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3df683e00f65e30fa58f601672c28aa6/larotifab.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wewimebidogarosonuwolebak.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/74628522227.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 17916 bytes
SHA-256: a77f9107a37eff37ab049af6ed44b8ba915174bf0a0019f56d15cb3c1687f2c4
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 11072 bytes
SHA-256: edbf5e865d142a7976bd09a27b8e62cca9ca938ede235addb948c7951f8129ce