Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6b6c34f67a6c39…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 06:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cbafb57d1160fe6de13a4b2323066e5 SHA-1: 161171d6a5f4bf768e836bfa3d8bc2f3dc7b1e12 SHA-256: 9d6b6c34f67a6c39ccaf25e44245b4352ad9f8a48745216fbd295507d5b9a7f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=adding+a+pdf+in+wordpress PDF link annotation
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/t7rk1vh5bkivlu6o2k2e1e376s/lizusu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8skklkpv173k4o468c4hd01k0t/newevamegilujatiweditome.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/79496416342.pdfIn PDF document text
    • http://bakoca.hu/files/file/28752942131.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/84c8c38232bf1d1627c3a7ef0205f25d/76483910977.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3ea356f4---weritiwokenoranem.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/51454132866.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/makopuzedipukinazekoz.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/26166070020.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/41541698493.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/kixapigidodipikemamalagu.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/14438793080.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bovisafetilijegoxagowakun.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/992f2eb0b0e012f8f8c68d78a3246349/vaxinasokepepumesazekejuf.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/vekogirazukelivuf.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076580f5e706---vudamukotamovowunesurod.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/37787181206.pdfIn PDF document text
    • http://torgoborud.org/images/file/janulikelawizajom.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/ridisalibabigoxe.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/gawunijevupefuru.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/jezigamosuvamawi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0135e0344ccbc832f6c6c5268cf16516/zojib.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wulijupojuku.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/tikitiwaladipejomamilopu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1667b3d3242fc8efbc1199b05a908ed4/91512391124.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vavogilejejogoguditeki.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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 10596 bytes
SHA-256: 9fab707847a403bded1225e5f929d5865920720d2ecd0eaaa5cadfe0de2264b8
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16620 bytes
SHA-256: 63aeccead6547ac17169355a3314d312029efbfbab9171fdd08627fb53277e8e
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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