Malicious PDF — malware analysis report

Static analysis result for SHA-256 6106c4fbd30c3f68…

MALICIOUS

PDF

93.3 KB Created: 2021-07-31 16:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ff10acbe43427e2d4851024eee0aed7 SHA-1: 653fe3ec53a655d2053f60fb45ffbabbbd2576d2 SHA-256: 6106c4fbd30c3f68e8468b02d03038d150ac5a7e916ea17105a9b802160cc327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=how+to+use+a+rinse+aid+in+the+dishwasher PDF link annotation
    • http://agriturismocorteerbatici.it/userfiles/files/62193542578.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/33768195155.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/20698167858.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/4802118532.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/58002502600.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/19597791079.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/wewilitixixosadus.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/897cdb7c09dd20f6bf97783ae6a3a316/80688967411.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zenonofinusorosisaro.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfb303251---99189306662.pdfIn PDF document text
    • http://capital96.com/userfiles/file/31312396067.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/87864690645.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974bf2a241---fevegovukopo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/76655502658.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/55225493405.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e3vjb6ivbngvnffr6icpseu6l1/75454285153.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/9584281999.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef3ac2ba9---24781396841.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/8395373780.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dcc5bd941b01bdaf88a4c0e06ebadc2d/10930544355.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r2dp0jklvopv4dceup79167mt0/15845043577.pdfIn PDF document text
    • https://ivanamihic.com//files/kobavifoxox.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55265072673.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_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 10476 bytes
SHA-256: be98dfc80ce3d0ccfe14fffd598361fd9ecf0cde5d0aee44b3d533d546d92b06
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 17400 bytes
SHA-256: 1ab0964344adb87bc4db86571fc04e790074d9d62ab438dbc4e9b2d831865615
font_02_sfnt_off00014c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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