Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c39303f5007a64…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 21:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea0101ed1b28d4bfa8b5dcd86167913f SHA-1: bd176ac9d961866429b9b6cbac4fed9b18286fe4 SHA-256: c4c39303f5007a647b4601414b09d8cfb1c5f575de33411814789f5e5c67085a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kasand.com/userfiles/58474384391.pdf In PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092018474442.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/01609fc3f0c3315982f65e94bbd7f102/17122642456.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zelakoriz.pdfIn PDF document text
    • http://weldingplaza.com/files/file/wolaxun.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/54740812232.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/67858228291.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vugofaj.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/822d285f5e3c041a89e312f6eba1b0ce/talixe.pdfIn PDF document text
    • https://coil.hk/upload/files/zebas.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/nogemakalobovenirufakit.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210914001816.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/82558012621.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/695286a1fb771c8b8c69419f890bc11b/55078038936.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/16199430854.pdfIn PDF document text
    • http://oris-am.com/editor_up/wejekoredujosogisepuji.pdfIn PDF document text
    • http://poultech.net/d/files/73428897116.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/80195148810.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161494b3babb33---baparuma.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad421afe1---49300751995.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/degepozupuvisijima.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fejefanuviwezefumod.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/684050123.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/kuvofukusemujopa.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/31207048139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+ethical+life+pdf+freePDF 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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 16672 bytes
SHA-256: ca6a4703ad5be54a41991282f0f1b79bf2f8cfae074bae075faf1b2cad2879ed
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 10288 bytes
SHA-256: a19413abef70c7ea6be2849999225d3226cd53f1db12cfdfdcc44ec43b2f7b82
font_02_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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