Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0600de4be5c3232…

MALICIOUS

PDF

105.5 KB Created: 2021-09-07 03:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45c8ff12fa88df1e1f887ac237df7b85 SHA-1: 68c0b5f4d9a88006ceed7af2b4770a7edeb4ab93 SHA-256: e0600de4be5c32327b097fae89186ab352d21ad94a14def4a62a9e54a728f176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=unusual+normality+pdf PDF link annotation
    • http://indel.sk/userfiles/file/95110398249.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/22891043642.pdfIn PDF document text
    • http://kaies.net/upfiles/210730011347711800iv2oxr.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b643b117895---woguzevorepetop.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/40391465375.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1e64ae85a290f509050e0ca5dff39171/44156892124.pdfIn PDF document text
    • http://wohingltd.com/userfiles/vinorebetixojupija.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/taxuv.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721532d50d---vevakigivilibufipatoxi.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/pebidipanuwexigut.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c961c370a1---nesalibamewufidevava.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/77885f8b832a3321125f481d48f4fe9b/8295910431.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zifotagobomisidut.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6d4b9e2c---71524556956.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9145fc7f---32389280898.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/338012348.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tixapazaromekadodetoji.pdfIn PDF document text
    • http://planetamama.ru/files/file/kedukesizasenum.pdfIn PDF document text
    • http://msiutilities.biz/documents/sijot.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/guzubakijenaxulesusa.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/59930435799.pdfIn PDF document text
    • http://nfc.soo.jp/file/39634703968.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa1dd3677---poxobekejibirese.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_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 18620 bytes
SHA-256: a3278857d5fa8ebb7c6b5f6196113784539c3ec4fa0d67ed2024418c0f18f7f7
font_01_sfnt_off00016753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F6A 10748 bytes
SHA-256: 8ed41b9972d8feac69a28693ec8961955f122578535069247cf4f81d3488237b

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