Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80d6545fb7371e5…

MALICIOUS

PDF

87.0 KB Created: 2021-08-02 05:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bcc86b7eadb1c79153db559c89f5bab SHA-1: 757a5d2e06aa3e8913580527706b2f3a5184849a SHA-256: d80d6545fb7371e5e72b5625b18fa4cfbc8c41888d82c34823900214304f9583
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or distribute further malicious content through these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac174b7c3db---53548552398.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce55f0b8d---6111540323.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7cc62790d95a8bd5807f3bb0d6fae45d/zoxafalagujibeza.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/61336834522.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/xowibe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfda537a7d---wajerinofatajinataz.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/472c7a32f3022a14aaa179444411c959/vovimiwadixizafila.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b39d8340f783c2b43f0dd2e02f7e29af/bepaxamuvibugotanazabowi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/49798874023.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72b6ee30abb6361cc716b9f8b9fd249c/sazogumijap.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae0a8be31---78401929462.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/t7fcfotthd26tt51tnaq5j2ad9/46978568674.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/daec0ug2de7hcu65s7stgohmok/38118326488.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/31399396753.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/lalifovizofurawibav.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xojokoziworiwizulomirire.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/sosinowokigisekavet.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/4l8nat54atc86e7qaitmim80hq/63925909588.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/75625166611.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1513b746fedae7146632c78311c8dbff/892939372.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609623ae4e1ea---virajelilabedogaronujuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=brochure+design+templates+psd+files+free+downloadPDF 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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16860 bytes
SHA-256: c168ecf0020c5dec3f136756e1002512ef07cacd5c66b9e8acfa600e4c1510dc
font_01_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 11304 bytes
SHA-256: cd566812ce69922fb4d1c9fef9f7ad9f9337143095c64d81290b6ec334855c77

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