Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c725fecc172edc…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70b1412ddb911293d1e90fe7d9bd8f60 SHA-1: 5a9c2d221c3a32b38e8b5158e2910be3f823a55a SHA-256: e6c725fecc172edc61fb2ac9687fe537074baf24296f0be465faef2541a040b4
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 websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bearings.vn/images/ckeditor/files/27130499409.pdf
    • https://vinacomvietnam.vn/uploads/news_file/63914244356.pdf
    • http://wych123.com/upload/files/xaposar.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4d84024a9379981f02d9a9a93c65b4f4/kiperegonideru.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15322b1a3e---35332828982.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d59b79091---59066810571.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/radetazawekeruzuruwijuzeb.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094261b0f4fe---kisubosoze.pdf
    • http://peneleos.pl/userfiles/file/gobafam.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0bfe4af6c---letovimomewuronedazuzor.pdf
    • http://candientuvibra.com/images/file/82585032505.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hk76a0u4imt540mmeehnh1ksi6/ruxejugi.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cda9591c---levuxikafagofenu.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/it7ju6i3kvu1083s41iu2gcst1/zamagunuwoxisimugokizum.pdf
    • http://busankid.com/webfiles/board/file///xarikalumefunuzerija.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8cc6d56169fa4f1251dd9220555f38f3/24220207815.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a111d46a25---kuluv.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/la7vb3lbmqleeempom9fgdhrj0/38085775575.pdf
    • http://vivatbacchus.hu/files/file/9225378650.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/38832667444.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja5qqa146og1tsth7lrk0hcune/25301324217.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c26673afc---2049447447.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27dfb2035---67375566818.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/13d0bed0e3fd921e083c2b005aaac94b/62457360482.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=five+star+frenchies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
font_01_sfnt_off00010c62.bin
8cf07ec5f667a98c96f389c837bc7a9c8b5b8d5259bdc7b54b1d6ae301e5be11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 10312 bytes
font_02_sfnt_off00012392.bin
6d5b6a92dd8e122d2df8c9f39a79658dda0710de14ef680cc8de6a21a3a4a994
pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 17204 bytes