Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b970a60536986e0…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 07:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a1b0f9c50309a9ce972fcfca5c9ac06 SHA-1: 7a1e9fe03fa9f1178e36310ac82037f812fab2de SHA-256: 7b970a60536986e0254398a3e83ce4a6152e2f194987cce54a3d07d3a9238672
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous links pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting, suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The primary attack vector is likely Spearphishing Attachment, given the PDF format.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://alutat.com/data/file/20680005411.pdf In PDF document text
    • http://ministryofrum.com/memlogos/file/tavila.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a545e151---duvegek.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/romuvefaramukudilotab.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/zabavujoxolubatemune.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/parulewalobizijizekaxiwuv.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/2540620353.pdfIn PDF document text
    • http://techbis.pl/files/file/63495492498.pdfIn PDF document text
    • http://identik.hu/editor_up/zekalej.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7kvjv3o9kp0u6mkurkk8ckio6/42490479406.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/20997174831.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5bf8228adf37c5234ba9843c5a5f5851/tosikujojuzonawenoxap.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/xazis.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b16284e5---6866942451.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df42f0e78f9---65268889672.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5e2ff6c0ff730e4b2ee38f991d664c61/bojokazalomog.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/49823112525.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a181646e4---pamopokukinudonajunifejam.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b5f527b14a4047174930e25ef05d1db/komegumijunufekofufuxik.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/mudisoxusibaxabugal.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/girupumonewajunol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mimi+kara+oboeru+n3+goi+tieng+viet+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 11192 bytes
SHA-256: 91116088134cc790646c72cd91cf07381bdbb972de30362fb314fb517f969966
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 23592 bytes
SHA-256: 11127d7112f6763654e6892eaeafb109dbe758ba35043ad01bd71c520a48b532
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7

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