Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c4ca2ab0a08b86…

MALICIOUS

PDF

78.7 KB Created: 2021-10-11 22:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0dd08428b200b6fb336d4a6a039774d0 SHA-1: 73e2e4cd594f2d7afe489c05192713d477689a79 SHA-256: c7c4ca2ab0a08b863a957f26995b37016e77a217e87081286a379b3e83f8c862
164 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with several URLs pointing to compromised WordPress sites. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=541+area+code+phone+number PDF link annotation
    • http://tcsklife.com/filespath/files/20210920222311.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614b46325409f---norikaja.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/lojizoxotiwabisan.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/gerapelevirefod.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapesibabosuxarewevalub.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43fca8ca7---89079349092.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nodilawetowapufavameg.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/56734964607.pdfIn PDF document text
    • http://all-premium.com/user_file/files/bixudosewefadorifetaj.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/leparagufitubukiwemupu.pdfIn PDF document text
    • http://receptlap.hu/files/temujan.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/40456180123.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/vifikenewozerijelut.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/41849557147.pdfIn PDF document text
    • http://ruihuitax.com/files/file/37279212744.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tavilojaxe.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zasawumumofave.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d5c09df6d63442533c4c15095e6fa01/442076543.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dazozitapifezopi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/69f6cb13105d8c60215ef6e6580f1f50/97627598391.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/zokimaxezivozume.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/motelarodat.pdfIn PDF document text
    • http://dges.in/userfiles/file/20279330196.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_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 10780 bytes
SHA-256: 08dc43f816361166b3cde549c7deffbd1f28cb3fc69a8d3c830f9e0b13c29fb3
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 17912 bytes
SHA-256: 829560329104c62b2de3ddeddbc1665395ea4acced74c4f7c5a1451ee996c744

Open this report in the interactive analyzer, or submit your own file for analysis.