Malicious PDF — malware analysis report

Static analysis result for SHA-256 a363b5be52ee77cf…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f998dc0425d41e733b7686107cd20566 SHA-1: fd2d7762593b9c42902de334b88918bb04506a6d SHA-256: a363b5be52ee77cf2197801aeb90a27472c8cb2341e88dcd5b53986bc291ad2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://esportenerd.com/app/webroot/ckfinder/userfiles/files/fogadidape.pdf In PDF document text
    • http://teifsepahan.com/files/file/loxulixisabarununif.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/voxazewodukomub.pdfIn PDF document text
    • http://ligneus.hu/upload/file/jigedel.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/18bd2a9f0d0f4b3f42368c7cdcc9e3cc/gunukonitipel.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ca146f2456ead404e1fe03d2b5ba33d4/90992235572.pdfIn PDF document text
    • http://agrion.org/upload/fichier/nikul.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1a48961a---tubazulojopi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6aa37f30c92b8e5994eff06eeb56af15/60623659826.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/53191678236.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609594bece5cb---tobefuzikagun.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/98209616242.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be3094b0da4d5e4f0d490833ed497f06/limaf.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1762138cbb---rasogogavaxaluwid.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0405332586d50b1868a901921f3296de/tutofofosubewujor.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/8583517395.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16113371800a02---sepasimubidiranunaj.pdfIn PDF document text
    • http://reflita.lt/uploads/files/gonatekowu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zudelasisagupevom.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tuleletolibor.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/migobadewaliraridox.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609237abdfbd0---32968461649.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/75580601880.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/binibemaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mixologia+molecular+libro+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_off0000c69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 16968 bytes
SHA-256: 7a512dd3ab992f3df5307d85046604924eeed469d535b5bb620360c721cee5b0
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10928 bytes
SHA-256: 6d60837eb7250ceb9952dc1580eb8db858c3909c0d838ce2044427bbdac15353
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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