Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a60e27655c2e6…

MALICIOUS

PDF

85.1 KB Created: 2021-07-05 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0956b48b92cfeafe04bd9b163919b031 SHA-1: 4c11f25e2237fc2967eaafe0f8ff3e89d7195791 SHA-256: 3f8a60e27655c2e6a062c45cff5bca00fc9961583e1bee713bf8f0007abd1662
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5cfada73---telejavolozegopodumu.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/11pdj86km3gl9jnpdk5r0l7olv/17880600948.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c2rgjv7u5jgr3r0binavs9gusi/ragemoteto.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b12131dcd---24365369948.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/34855350293.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1d2965d1ca92e8baa6bff5c2d769ef6d/41652683008.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ecee3f35---67185797193.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/92c00r97kbksd557a8e84oqhlr/3857367730.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vafapupikuwivavupupanel.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/71123598348.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/bojidopize.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vjvejcr8ol2lrgccnism16b5p5/goguzebexat.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216517426359.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/visavaseririfekozebunaw.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e9c7ef5f---52054585004.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/45538666413.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/komobiguxujogobejexulufaw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/230fcb9cdf4ad01d8ce1ffea4d0c0a3d/pinosu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xewanixonok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=view+raw+images+windows+10PDF 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 17480 bytes
SHA-256: 21f2d5cb662821fec434909d908ab58ca3f3e4d2e06f8d2fb9fa78a04bf01363
font_02_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 10676 bytes
SHA-256: 801a8a521ba9d3c64835ce6cf91710a55ff0218632c894945ffb9e0cf4290f17