Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1e2f0ee55bc794…

MALICIOUS

PDF

134.2 KB Created: 2021-09-02 13:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58862459965d342e19306d8f5cf4f121 SHA-1: 12bacbbadbdddabd1c21b1a28c4fcc8f19789545 SHA-256: 9a1e2f0ee55bc794e19f27aeab0f2e480b403ab1ce1d07aaefc0232e637f9bb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ClamAV detection and ML classifier further support this, flagging the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://firewheels.pe/userfiles/file/vetisixufofawosavar.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a3b3212ae73640c760b644bb669acf1c/goxewufiwesawik.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4n937v8aulli60n7bmr8vbohjh/59207550219.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8b2da60b---gifugerobinapodozom.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610e92ffe7b63---rikupofupirax.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/kuwowonutakewulekewe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160822d21e7352---tafik.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607069a6cd14a---95468142341.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/kijigefukilopigakuvef.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/608650f5628f6f4c385ed76649db2022/80402564447.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/75335046738.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/72224145337.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/78435280035.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5efcd808910650910841df8d3cc00e06/lizemesobelemaroriloxivig.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783afe513e2---56173490066.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852428d476e---43808497676.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/77647e5942b14793e7350923921d755c/82701192865.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/4pk0p0tdcvg03n4jtve4v73in7/puvewepamudozozimi.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/nijarifaxamibap.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/1v0sick6fg1em5bprq10bnq906/pavemunakuxatasevajifo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30c3ef1524f0b5f32e8c88657ea9dcad/83770011653.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/8057770878.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/42425790061.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fd80beb8---34035356867.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e766dfaf28eefbc0abfda92d8325b0f2/jezam.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec9973232---feratoxawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=melodyne+4+studio+manual+pdfPDF 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_off0001a7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFFB 19140 bytes
SHA-256: f575713732cca2289ee934c09c6bea8519029bcdd220e439cb954c52a139e6c2
font_02_sfnt_off0001f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1DA 10844 bytes
SHA-256: eb8380a353969e1bce47ad94004d7c61910c498a4c6591dff73650f6251d0be9

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