Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d9e6f11aede86…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 08:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 01f5ae989af7be863da62664534818f1 SHA-1: 84b662937f2e5a11b61eac23c83d956efe1b3242 SHA-256: ff5d9e6f11aede86e4904b656941568300f2d741f838549ff674e5e5483990c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple URLs pointing to other PDF files, suggesting a multi-stage attack or a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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 http://emilygrilltogo.com/uploads/files/zatafod.pdf In PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/68059755641.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/lekuk.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ce3c28e6fe1ec090d744ecf00504713e/55388008575.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/27619060229.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5383e2d2---nalusiwekexiwevoso.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/woporaw.pdfIn PDF document text
    • http://benrassam.com/uploads/files/tipimokom.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/28154221308.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/1631895769100.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/rizerezenujakofixabeti.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111721243224.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22117921897.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1ed2406568e882ee9e6afdc0d8c4b2b1/dusanetejiposikapejo.pdfIn PDF document text
    • http://qdjshg.com/files/file/64970665531.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/60793418824.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/86388994011.pdfIn PDF document text
    • https://primer-spb.ru/files/files/mupotujob.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/18720166210.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/mifemiseb.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8ef3b433b---nukotifezopedivet.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/legogutasujap.pdfIn PDF document text
    • http://arsvet.ru/img/upload/10308028008.pdfIn PDF document text
    • https://bor-diing.com/upload/files/85539851662.pdfIn PDF document text
    • http://stromzeleny.cz/file/65032528345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+free+android+messaging+appPDF 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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 18796 bytes
SHA-256: a2ed9be51dea44108fb16b807eca6c3d730072ae68ae9c5a17c09c99682ceb01
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10848 bytes
SHA-256: 6bca40980ba2153c9b0158356fe2ac3d370f47d1fabb84c2bb915d1cd2e93d4e
font_02_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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