Malicious PDF — malware analysis report

Static analysis result for SHA-256 5882375992c02ad5…

MALICIOUS

PDF

98.4 KB Created: 2021-07-06 00:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e8e55ebe7432e737e0f24cdb6dd185c SHA-1: 80dc77a86c698764a563d9bf2b9953bb935212e8 SHA-256: 5882375992c02ad530d51df93fa09e9c6968acbeb7ed7bc9fc2c966bc06f5faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple external URIs and the overall structure suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=identities+worksheet+for+class+8 PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r29vvnbre71a77ikmi9ucp3gbv/82834035346.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af825d014353ebfe24cae38cc646e089/jisufoxinujuzo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0ca8f06b---21715629404.pdfIn PDF document text
    • http://secretinvitation.net/images/files/57324381132.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/4uus96kl9u5cr4o25iunmh7t8q/dezakaxom.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b69a7cdab---8345821383.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa70d0bb42---37445597277.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/tavonodimoribegu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3fe7ac440857e07a5b5a4bcc69bbdc78/nenanorigadodapenunukam.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814b28039db---tezukisevazafoded.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55856740649.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8mlb5gdah10rci9u8kbjh82t8b/jesevamosufurovur.pdfIn PDF document text
    • http://gptools.net/userfiles/file/madoxu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4137046ecbedd3ba35b66c8c7c0eb00e/34047073269.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec12b17293---xomowubidofiw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160834830336f3---46278835593.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/edf59dd5488b2907fb3863a697385c2f/94594207264.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/27451684243.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/73319352162.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0283cb7f843e0b75dc54c950f2750b98/zejavafokezaf.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbcbce49---76928427721.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wokudofamev.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/jovabupon.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///67048129255.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/iac4kpjfdv3bc2sva1pkjdcj30/88162844485.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_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 17844 bytes
SHA-256: 113ecfe0f5b960080e9219becf3387833701966a8819c974ae9f3c2db7e6c3c8
font_01_sfnt_off00014aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16302 10908 bytes
SHA-256: f7dcc57be88afce85772ffd3705efc29652d89e61e6837a3015b6c3c235a09d1

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