Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab03e833eba74e1d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 14:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bebe537ca61700a27c42ccd5d3c4e51 SHA-1: 82cb4265492d4d331c29aaa7dca70b96c962f0a6 SHA-256: ab03e833eba74e1d211486959d8d7e3b0497870a3e49cd4a6d7b9b266ef4b0a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point to a common tactic of using documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=windows+link+android+phone PDF link annotation
    • https://interstudy.net/userfiles/file/taduwojeduwelimokod.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lafosutubesoxanonodudukux.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/pozepusu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89886470281.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/jajojasikugib.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/vupovilewatujotinibuluzi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/233801d5788930e844f86026850d17a0/84092652564.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d8570c8a---pewugaduna.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/55493186154.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/57372501005.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zuwawe.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/55352732736.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/givasaw.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/13474350315.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/52838230772.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/xuwano.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/45075546152.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/202452b40023af58d1f2c97618450052/85493078650.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/vozoma.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jogibipajukopewizijojixix.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b0a3e436---sulexejaxezazoginikugovip.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rokerisuxevividi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/94448308814.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wafexubagewasededowar.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/58037529667.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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 10564 bytes
SHA-256: 12db4dcf640a0c8153ccca1e091f44235136ce1f0f538fba92379201a3c8ca5a
font_02_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 17392 bytes
SHA-256: 4c4f9f92172736c6f6a631331c83e16cc1e6e6cda8f08f3b14edc15e80a876b4

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