Malicious PDF — malware analysis report

Static analysis result for SHA-256 559d1d0591d88d70…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a585b8ed0955d5492f001f5335dc34db SHA-1: 8d61a9046705aa1c9c8fb24c8a8677ce14f5f278 SHA-256: 559d1d0591d88d70616bbf9d0ff72b8537b9005f620d9a6134cb3775731b5060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable domains, likely to host further malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=watch+im+a+celebrity+online+free PDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/viwixazununajole.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/wipuvuxubesete.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wumimagotiginatin.pdfIn PDF document text
    • http://kmsenior.org/file/files/fidetope.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/57975624887.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/97610803891.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/jonererixakuxalakotu.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cphq24umemjb2gqrc35n8bgdjs/85675882298.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/83385453470.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/18373135179.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2904516ac---kinezagufisu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/64485293004.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/60427521998.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210914093346.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398e3d2c676---liwogo.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pedijiwitonoliwi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/disagegogaterekopujurur.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/wenegoga.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/wexizegaxakokebuwe.pdfIn PDF document text
    • http://dobermanncz.eu/files/titamab.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/benijaxuwujokobo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/19082388638.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/nibudenerajapikug.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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 17844 bytes
SHA-256: 0e9d7276abfa715f5094e0adfe5eac29e25dfaa66869270334d2bddfa7706e78
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10680 bytes
SHA-256: d2527095f8851a3becec0d6cf7acb61a77e8d9f4a6cafcbf5b9d3ee4e15d7cd2
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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