Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e66bc6638f7122…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 13:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18134671fd6e2778043a11025ad99064 SHA-1: 5e0f6a1ae93713ebe24b7950b5fe0a3f51f290a4 SHA-256: a2e66bc6638f7122a2c1c2a493b6dcacff9250c3dd1d3ff9b80280508d6403f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca844be0e158d5b3fb3fd20c71e82ba6/72271165584.pdf In PDF document text
    • http://eia-edu.com/userfiles/file/bubizepa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4qn0i4s8ed8o5vmraur8777t4g/tuligenejiz.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/zozipeda.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/euvo08s4q1qcd92rehf5840pgl/webujabujuxuxolux.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tezabufosanatad.pdfIn PDF document text
    • http://spiregene.com/image/files/20210729_212446.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5423aaf233---13140003404.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bt046o93800mikmfsedjb6gpc/mamuwazujurufifixozufubub.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/vutufavirof.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e11663c042e5160d6d460cadf09ed6e7/33467885360.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e99b36d39150b4bc97054baa86296d8/99065306923.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/xeduvumelim.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/32933382696.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vexavak.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/togowubewaro.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/80269898215.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/sozojebuli.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/56844466432.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/rupurikanefokesexu.pdfIn PDF document text
    • http://topstec.com/d/files/71773564810.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ce8beba54a3203a80ca290101dd2077d/xiwajeguterusizumawonexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+crystal+extreme+randomizer+rom+downloadPDF 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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10988 bytes
SHA-256: d07640f6f47d24fce42a86f24c9882c54d078b70a68dc94107c5f0fb45e8b29c
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 17224 bytes
SHA-256: 3aaa9528d2e59630bf84e2f3ab3adf316a0b412b8f7e2962da20d73a7febef0b

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