Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b384f4ca911bd3…

MALICIOUS

PDF

105.8 KB Created: 2021-07-21 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 542b042591a6e9b92590eae84ff9ac61 SHA-1: cd318e4918f26afac796f8b10c30df1b62a0be03 SHA-256: 50b384f4ca911bd3cfcb2ef0998515ce5774f6c42bf0f67dff59fddabeeb9ad8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4e1773d8---tidozoroxod.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/2106030549.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/toreninizep.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a15737f78edaff6f0141345142915082/zadat.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/vavokubenudetexu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/96848926506.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9993dbecf---wenibuli.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/005dad0c5108e5a070070c35a9b57ecf/65475783920.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/resovebanu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b306ecb7f7b6a9eaedaebc82e44b5509/46327011161.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4179e7b3---55954927207.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a9f66f811070dff941647f55abf799eb/pekixufegavimetexi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/abbd75c8b822abdd5b74f2ab8a650df7/24180721320.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169967b9f---78008633666.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/duvufiwulaxugep.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/nosusipesemapope.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1acc6a704816b22822ddee8296a74466/zizozu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e026d31---nipojixuve.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/75873557941.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/muzimigutisavazipero.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2b16cc6b8baed2739e02c3993eb270fa/pajojipotuvovira.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/belabivaji.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/buvulevifazezopixomavixi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c31ada0ca---xedepufimupipowam.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160927c9e72e0e---kemuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ashmole+782+discovery+of+witchesPDF 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_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 17188 bytes
SHA-256: 8ca799becbcca9a22575d02f1a3f8b63dfdf86709d3f1b053ead144b0dc0611a
font_01_sfnt_off00016796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16796 11100 bytes
SHA-256: 0c2b1b1bcef9ca0acdb17b472093d1acc4b302d7bd1397331d04358df54c83bf
font_02_sfnt_off000181ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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