Malicious PDF — malware analysis report

Static analysis result for SHA-256 b085278c9d2dbe96…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 04:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75d2ad1345e85d5d1182e521f95076d5 SHA-1: c279bf791e131e0894255184733af4706f6318ee SHA-256: b085278c9d2dbe96851b4b7833bfd8e15b919aa270540d501e2aa687215f6af1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=ivy+day+in+the+committee+room+pdf PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1fa58aeb8d5e54e237d272c4884230d5/robofatu.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/75484052632.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kijafadeditujapoles.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18653df668---42716356554.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c1d6e7d3887a8a20763d95bfe19008c2/zukinufasumi.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/30681961521.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/mowapanodizubaletoj.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/76745819910.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/baguxotagiwexunexejesir.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/85045257936.pdfIn PDF document text
    • http://beiks.info/public/file/79431536565.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e9a28c69d0dfd5ae1a84a57d7dc28d88/99516815439.pdfIn PDF document text
    • http://palami.by/images/file/texojilanubivubit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lowotoxexugisorugixiv.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/33892359983.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/54618472020.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/29a3c9064f65e31e6b4bb546e283ed93/kurapilosufutofozemokimom.pdfIn PDF document text
    • http://anpo.vn/upload/files/83244949733.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/48769826547.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247728940e---xinugujozurevapelado.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/17242720549.pdfIn PDF document text
    • http://getem.plfiles/file/28644798952.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kexufovesurugonorakegapam.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/48d2a096d6dcb1bdc451a282f041c76e/gedarunuzojesudiwobusaf.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/90701100243.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/jitorinigofam.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 10804 bytes
SHA-256: 89f8895b85be814500ba232c05358f2adcc9f68e929de268bc7fb00f48bcf6f1
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 18340 bytes
SHA-256: b6be05020cb8e96d8de92b3454e936d9f18bf4a7d18ccc5acc01f3b3cb67366a

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