Malicious PDF — malware analysis report

Static analysis result for SHA-256 236cc6e557702f20…

MALICIOUS

PDF

84.3 KB Created: 2021-07-05 08:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99a908e29f64bec2d82c61446219bd5c SHA-1: b5295a14375cd7082b11fbc9b39fd5c8635b53fa SHA-256: 236cc6e557702f2022979fa46fbd1f8e0a33a70292604145d699e6e4cb263f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://crysiq.ru/uplcv?utm_term=lcm+of+10+and+11 PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf9b6a9ab---76047955509.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7a89075f---45183256973.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogodudetebonaxaxi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/54409785398.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf6186ad559ddee8bf69858ef684f7c0/lanija.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ce7e4c1db7718633afc7558697a228a8/97299448847.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/984a643677d7ceda803b2c332c364014/7916614806.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6947802a650f1aa2b3b4066f3848ac6f/89239228239.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/42690886577.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc84f842a9---gufazagulimanizilenod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42523c302c---ripisadog.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/91096223800.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/18021929110.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b993edfb37---wapomumufenetolapijibe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/264bf6371ffc81018a7def1ce26510ec/faxanilelirumumegulozege.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/29853683763.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e8b27cad83d90589feb4da20ecd3bb/63745158056.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1md04nlrebgjo9o59579bmiu5/xiwagegiwel.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/3144463643.pdfIn PDF document text
    • https://emmaushuis.org/pages/laduladezi.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/81667141702.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/66235125860.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 17156 bytes
SHA-256: 2494f7a7ccd59ef9b5aa6e1518c5293189f2d6b02cec6c18448a87514e4bf6e9
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16308 bytes
SHA-256: b600d6a97b2917e7dc113c47777fd67c317319f2881e35515c3d227bd53eeac6
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 10132 bytes
SHA-256: 783740137303c67aa3621cd78aeeddd5e55a224138aa989848a59d4aeb784ce0
font_03_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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