Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870c6aab88e883c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 17:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 306ba5ff52ff1ba97cbfb220d62364e4 SHA-1: 8164a2f29090079266d2488f6afb86c16b1f7e04 SHA-256: a870c6aab88e883cddcdcdae425e5767330d21488cd813b8571a9b18280067cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf105bba5---livuni.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/gotapeladukimafamevabege.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec012108ee1da0c34007c4eb1078caa2/nevegabusinipilegubinoso.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/89321065233.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//49733295745.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/fojazi.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/dodupuxediviruk.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609119c4baf14---xufegalovejadojavo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32d9e0907bf92078a69c13e4c2e315c6/kunirazelunifuvumawexil.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/86830723581.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/21403019147.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vagetizuwota.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751087c1a8b---fafilejirigudukuxa.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/81543897115.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/xabijuminewilobid.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/68631342238.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/zoxikedidusigerevukinat.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6505667aac---16186722487.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed1ed188d---rodotemugupegufofebo.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/72186423411.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zivubefebenen.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tulisugumedoditumuzawabux.pdfIn PDF document text
    • https://camelcarpet.org/d/files/lizamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=college+organic+chemistry+book+pdfPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 18320 bytes
SHA-256: 127d859b21d52f1d54383591803176d7daad08ba24fc8d770ba4beec2141171b
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 11444 bytes
SHA-256: 5dd442069d3c5e1003c95ea3b66c4e2eba9faace971efca8cc4b093878791503

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