Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3a05a020583b5d…

MALICIOUS

PDF

83.3 KB Created: 2021-07-14 01:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63364d2738e1d02d9e4c8bce852566e1 SHA-1: d60ebd8f3a0b6c5794be1847c0152cea73de971f SHA-256: fb3a05a020583b5d72228d3c1759a0bb02fbe2e47185e9f80ac626f364f5a007
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious files. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into downloading further malware. While no scripts were directly extracted, the presence of multiple external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf32adef9c2---dogemonuxonoposaferezebo.pdf In PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/15331904021.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2ftldlveh8rj498htamjt94iu2/29714530632.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zudizavajirafaperitut.pdfIn PDF document text
    • http://prosquash.by/data/71268486370.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099710d0140c---99873085549.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8d807b2e---kitusazizisefedevelad.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8bcb1462---49742532197.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/70475075363.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f08c9274d---79880333542.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc3e29759---xagovi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/67911022314.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/sisuzin.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/62339790219.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2adc89ad---62378639461.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c501bfbf6---vajawa.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/89987798603.pdfIn PDF document text
    • https://fallsplat.se/file/zulibiganivatidotemejon.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/94094069300.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/15c19676aa23fb3af1808d6cc41528c9/gukefolixob.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6614ee79---44897097840.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jk6uq5t02hmcijf07url2i7pc5/sijemobinujopef.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/dogimiweza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cash+and+accrual+basis+problems+and+solutionsPDF 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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16824 bytes
SHA-256: 731a38ba45810b16ac7d94a24cfb8f774d21d4778bc5170a083fad698aaf04ad
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 11048 bytes
SHA-256: 3def5d7863c3ed3167ede396fa00a225b069b725e0ca08ba1be11e64cb044cf6
font_02_sfnt_off000127a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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