Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebbff91b1a6e36e…

MALICIOUS

PDF

76.7 KB Created: 2021-06-14 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c3437da6c135db67b27132ea097fcefc SHA-1: aae9f6365bfd5747d5b96bd8bbd33388710e9835 SHA-256: eebbff91b1a6e36e00ce55f3377763d891db03d259a0df8248c309ea2c2cafdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or link-farming scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate that this document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=best+pdf+reader+and+editor+for+mac PDF link annotation
    • http://asustainable.com/global/file/63540734206.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085044c27ace---24568438764.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/29083088326.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/2544517556.pdfIn PDF document text
    • https://digireg.dk/upload/67295831173.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429418246965.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/76820c146e151bcc92a8d6e1c3d0dbf8/dipogaxufilebuniwuwet.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41257730219.pdfIn PDF document text
    • https://vaynow.com/wp-content/plugins/super-forms/uploads/php/files/e792ab6ed48359cd23d60302765b4028/73079073438.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/7762914049.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/70560893924.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/xetaxovazikanorujude.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nufovaxunelolegizinu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc895931---jififadogidaredobarekaz.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l4l1bvp9lq04spauhdag1jgk1c/gubupejotig.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ba911d3f---lodixefepudodelifet.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045f1b31ae---segoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 5320 bytes
SHA-256: 8b057341d26a7da3df417c75fce283e4cbd576f07ac3415a87889daf72d3d0a5
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10284 bytes
SHA-256: 6861c641150061207a4963cf1a2280335e126934a0c88268f85795dc0da11868

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