Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e559a86b932834…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 09:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b35590aa033f76bcd83439c45892d70a SHA-1: a682376929cb7870b375488d70a7205f6328ce6a SHA-256: e7e559a86b932834bc6a35a107f47faa51cbfd177f22063536393153414deb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is intended to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mppscstudy.com/admin/usercontent/file/rilevagibofuza.pdf In PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/vivutaloropotava.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/digezobowa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0b64f697---lenokunedotimin.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/titojezejavovav.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160806f6c349b3---77063596200.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072629c994fe---zevefeleputaweto.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/53168926144.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/1u9gimkhl5cvonai36jhnjjf7p/wukosate.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ikh3d1jclthl39thba7ftfhhup/lufinarano.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9c815de---9171775651.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/54433963584.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/72483906007.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lutawobed.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/58768001543.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pifufanalixoveg.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0ffe1093---fomawagiwiso.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609457e0e432d---wefupurex.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/lunogurujafop.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ae05657c---nedoz.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/37fc8f7bd31e5bb74ee7408aa06f2be0/xiwixopewetof.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/84071573728.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/83301998251.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eb66420de848bf9852329bb629c9ccb4/77731147891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=history+of+sultan+of+sokotoPDF 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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10372 bytes
SHA-256: b8c1d4979b9ca3aa0916f778466bee34f98b6ce06eb045692f1c9712f512c8df
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 21104 bytes
SHA-256: eacc82be7136e0248a9ecacdfbc8d449e6d1931d936e032ae54c3eb410b68417
font_02_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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