Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba259f0ab27a12c0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 08:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c76254d5c77c6a5f195ca62a08c0a6d3 SHA-1: a3720c7b640ad8f3f6ef5d1dbde6528a3ed4161e SHA-256: ba259f0ab27a12c025024d27988581c5e1d72f7834c534ca6bda7edba842199b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting domains, designed to redirect users to malicious content. The PDF structure and embedded links suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://naasschoolofmotoring.com/fckeditor/userfiles/file/73110104432.pdf In PDF document text
    • http://firegallery.ru/img/upload/3165601765.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sabudekakoleravajij.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1da23e12d70f3843252fe6e9ed144a90/fefigajufomina.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/61372238196.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282d0246ce---63778776820.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/84794500691.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3norvm43jc9clvppo7b528oag3/76201554318.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/regunokoxegikev.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bgqnc2rste14bppcqk71odncjf/2958466722.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/galugitanawobemuwokevowa.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/satumijaxorala.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04b9f314da---80100194600.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/68762158912.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/zoxugijogebipekonive.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/gotiliv.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/kaniwopenuzuxemege.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/fumumix.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c6a4e77ed---kefufovusepegaxik.pdfIn PDF document text
    • http://simonide.org/userfiles/file/riwizerub.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/861952d1b55d0e57dc06a294e547ef79/rewakepemozevon.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///39506887506.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160948211c64b9---kepoferijosure.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082569479dab---rotulozozelidapixilewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=smallest+three+digit+even+numberPDF 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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 17824 bytes
SHA-256: 9ed91cd3d235996d88048a7a705e70fbd445e9dca8aae251d62b0ba12ca8d64e
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 10956 bytes
SHA-256: 989668c7f99b7a44e4abb12282a06a85803968ecdecde053e34c92b658ec7325

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