Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f528d3cf951ba17…

MALICIOUS

PDF

92.7 KB Created: 2021-06-30 16:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8831d396b677f6c05490239e6544835e SHA-1: de422b76a354974555d19c95d92841736d9299d4 SHA-256: 2f528d3cf951ba17a747a291b3f220a614d2d8bb951c62743127832ec228ed5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites and utilize a link farm strategy. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary attack pattern observed is the use of a malicious PDF to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fd0ec6cfd16cca5dd89cad4877f4fb77/xuxetaligerutude.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078733dabe45---26759482501.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c8a0f15e6---biwedenunosavipadibumuro.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f002e866---58448312664.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/92726630522.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gsjm918ej3u9v8ta0cdpdlsbit/digilonolejuxajujabarodu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bdb5cdac---52458862771.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/je3gk4k00qn75lqulto83o95v1/19427746369.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0a265bfee28968001d429ad213d4d3f7/beredobutilen.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781683396c---gukizenaj.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xabozorafilas.pdfIn PDF document text
    • http://aplus.to/userfiles/file/69994558425.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab546306a---97983158309.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o4itsh9fatl7fjeutpgreamrj3/bodilegiline.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/tudoduvupasefotipijiwawa.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/840lfqgn6qlrj1ua82pkd4pl9d/17808922692.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/64824565818.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jagolufusi.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/2142353423.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7bcca84489697141426ef7dc33cce54/60099351445.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3l2c45h9pc7fa1udng50jm515r/pikarumesiwasifusev.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908814ad3bd---97054279382.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078059cd787d---ranezegiwavoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=scholarship+for+general+category+students+2020PDF 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_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 17764 bytes
SHA-256: eb2c08be8ab30af739a7d5bd354c0ca10bffdf9203052a4fafcdd6d40565f655
font_02_sfnt_off00014ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 11432 bytes
SHA-256: 78191ef2172d5b25afd1b053731b63e44b35b45d749cd5613853689f38bebb49

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