Malicious PDF — malware analysis report

Static analysis result for SHA-256 da972bf40b834368…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 06:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 785934e7af730b63b9c12de9aa125c1a SHA-1: 6a37c2083403e6416c2d256f4647354151e9cdfc SHA-256: da972bf40b834368194463b8dd0df2a549ee30fa46a14215f0956e0b795f97bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also hosts a significant number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

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://inwebjor.ru/uplcv?utm_term=egmat+sentence+correction+pdf PDF link annotation
    • http://amandatravel.com/userfiles/file/53370204977.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/jujefagomujizenob.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/tatikodujovigobed.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bfcc628807bcfcd003e173dc9187b852/togopixuwofavijimew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a5a038b9---vutizufe.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7687ff3572ae7a291cca6164b6fbae64/gerajefibi.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/nofimebipo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d530b1395---82791512195.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa334dbb2---garawizigijorobilume.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/powabiwunulezuxejufifonom.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jafawisupu.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/96380352652.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/tirixuw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b63c7e19---devug.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/famukalubepebuxapupo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fescqsg68nlomjdug8c3tq5e5l/xitevalemisek.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/689cdf992d80eef6783c3301966f62d2/3865437282.pdfIn PDF document text
    • http://flexa.cz/docs/file/gitanagukewoz.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02cf9e25d---wobesulazikerituliwad.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/jegubabiwerinuzigib.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/dajefujubatalutiwumegubit.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/eec4a8391d67f4e52522e225078bd2d6/26537655193.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babd6b727b5---robubu.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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10900 bytes
SHA-256: 9018212014008c92851ac8a1cffb25262905321ce202248af24ba5d478f04a44
font_02_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 19912 bytes
SHA-256: 9ddfb74dd4a9952dc97eab788c8e0b9fbc492c6172743a029ae94e0b121b5e49

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