Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b27617c1eb91bed…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 16:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 52d71a8f2472ad8a0742d94b049a2070 SHA-1: 79bbcb54e90bba36367b37344e2d3e7679ba68f7 SHA-256: 0b27617c1eb91bedfd3ca057c05e63892c3c058b63afafa80e80ce34ed979bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or phishing sites. The document body is unreadable, but the presence of numerous links on disposable hosting and compromised CMS uploads strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075061ca8936---vegobikagazikopoxufamenat.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082189a01c97---62837031839.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b53a092a5da---gotivuwamofalijonalulow.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6d196cb6a48bf44ef63de65e55a9130c/tajapaziruzavevaf.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/jubosupewu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o7908ks3uk84dee7t8b99up3i9/wevazuximisonewatulujejun.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/376d0581dea2f56395163c4e6a3ccd10/wunadage.pdfIn PDF document text
    • https://fultoys.com/userfiles/lubula.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9u8g8sfui611htbaq79t1ok7e4/zatedapotasenujonar.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/quovne4p7p4224k1k26i6n2se6/kadobit.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zaretevamob.pdfIn PDF document text
    • http://katachizu.com/img/news/files/kureretilisofi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/61361270751.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/96713051344.pdfIn PDF document text
    • https://7gking.tw/upload/files/pakebugu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sukatigipolosolinubururi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kitajisurixelolibaxune.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e23b2fead---dajotazilurikuwow.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9cd11286f67f9a9b093cd3c3b54d32e1/58716517124.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a1cf80f632029364a3e989a9883c71d3/94593379628.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/nadodalikuxi.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/34921728023.pdfIn PDF document text
    • http://charivne.info/images/file/vufusar.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/domaxavepafigawerodun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=professional+reference+list+templatePDF 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_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 10644 bytes
SHA-256: 8d006cf547a17f0661d8ecc418001560f6e4578672c8d9cd2ce82a72c421b497
font_01_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16900 bytes
SHA-256: 99052735083e3b06075151afefa358dae31da243bd7750f8643ccd2f8a732f4d
font_02_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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