Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25ed881ac4305ed…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 02:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5256410056c48d452abc6ed5176fb1e SHA-1: 384b7527cfc34901482718c7487b52f6836aec83 SHA-256: e25ed881ac4305ed80c5766bc81640155bbae3128317d5d2803c5d47deb4a9c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ndmoyun.com/calisma2/files/uploads/gakominedatojobenisetilo.pdf In PDF document text
    • http://vaynhe.com/upload/files/94914303462.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/fifeji.pdfIn PDF document text
    • http://intertribo.sk/files/vival.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/56697808682.pdfIn PDF document text
    • https://rjpexport.com/files/57798357627.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rutoguvokinudubazixex.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/91680777449.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wafudijaporokex.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/milakefedorotal.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/jazufexa.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lilagasiwizegup.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161320623bc6f1---87431544422.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/wuxali.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/pupojubigek.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/manodoripomu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449757b83ef---43568407650.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/ditobavabetuza.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/13834988377.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b91d230ff0a2f5f9aa4aa1b782668e95/ridelewalibogawubovako.pdfIn PDF document text
    • https://allianztc.ro/files/file/mimezidelasigu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/janasazubamuxelasig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=racing+master+android+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53C 21144 bytes
SHA-256: 8dbfa73f9ba2b366afc492cc91af9f2166d1495b6e49ef6bb01cc8b8a0e5180d
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10844 bytes
SHA-256: c6f8c46e329b53bb863bc3eb8bffa29cf28d05f6202e6018cf52776073924b36
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 16064 bytes
SHA-256: f76835efc0f70b52b211676925d3c3919e6952eec6cd10f320d1ab287c5fabf2