Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cad2cd2e319378…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 00:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a94f671b4009c0592d0759557cd392d SHA-1: 5fa438bb18431bce511213098d4613e6c9ba615f SHA-256: 21cad2cd2e319378d996265fe4fb6e3e49b435141d51330b33a0b5f47fead775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=watch+super+bowl+game+online+free PDF link annotation
    • http://supair-lux.hu/ckfinder/userfiles/files/josarogaruzodozug.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nawodaliwomuj.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/10257970110.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/91206622342.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/85818681653.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd3018c24---51046475102.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/rizutelawajagemil.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/misilelinanufatadefa.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/42162507812.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210906012225.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/riwofaxitapilu.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tojupoxunapamep.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/75951151698.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/fabazefujikiwabap.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109230748130243881arlydm96rvk.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kotuvakoguzutedipoxer.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fojevugiw.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d56a1fd4---85813758315.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/junejozusura.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/27313778272.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/4941633080.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/34074256540.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/09fae68bb1102f555cacdd04c34f5281/patorotegezipe.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9874705175.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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 11244 bytes
SHA-256: 5bdfdec7b39bafea25680476549c0848bbe91d64345a46eea8981e3e7a453820
font_02_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 16296 bytes
SHA-256: f4907676ae8980645e641885fdc18321da0adfecc213c8546adccdcbf0858b8a

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