Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee92d0b9f3c805d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f1c97f9733b5d2dec26b6d97adc4385 SHA-1: 798355016a218e3f1508b273d87d612311f6790c SHA-256: 4ee92d0b9f3c805dfdd2bfddae0d695421465e1327e7db1b9ccb5e0e9560da5d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://brothers-music.com/ckfinder/userfiles/files/38290920326.pdf In PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/56170876830.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gojikumemewakinuluzesapo.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/lozapejumovubipoziduzi.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/967cb6a0d232ffb26d82c58a863aa5d0.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/24c911b8546b6717de256cee28a9cee7/wuwodufujulekeparaxugepu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/70749221947.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/lomife.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/36788019492.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/33700918893.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/wosojumakezazutilolal.pdfIn PDF document text
    • http://htwy.com/upload/file/21763094284.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4f686f4c---23371989735.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/susepipukuzibepokap.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c593b4d045e---46478248569.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/63835114667.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/duvowusedozo.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/85688937029.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/6148786908.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/13cd4fa3f19ebfa4d6f76ea61580a3de/bexugili.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/93327168199.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78136457227.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/72061662806.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/molofipabiniwokomase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=beginning+middle+and+ending+sounds+worksheets+for+grade+1PDF 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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 17620 bytes
SHA-256: 884ca82101190df824d1cc2861c1a6278a9d335f67e96b0224770935a4802f20
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 11184 bytes
SHA-256: 4d819a009b309da1f6bacd56abb75e5e44d16ad578d80202e595b4606f33ec9d
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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