Malicious PDF — malware analysis report

Static analysis result for SHA-256 3416dc25e9d6e417…

MALICIOUS

PDF

71.3 KB Created: 2021-05-17 06:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d733a1079f031758312da9ad711a701c SHA-1: 11e618630de0d9d32491141c95f8f12718667961 SHA-256: 3416dc25e9d6e4170390ce5da93902f83769b87f1dc8162af474c5827802e9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=kalphite+queen+solo+guide+osrs
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/m1j1ot3dvri154lubbrq1kg421/jibalojamapabekasamunuw.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be6a094279---79261147779.pdf
    • http://atthaya.com/file_media/file_image/file/sivigubidetesaparadog.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6004b53b6---18365160513.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dv220jj3lcl4pa29ou5oq9nki7/43226740859.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d377eeb25---xujufogurukumelijulura.pdf
    • https://bem-sa.com/img/file/vilikeluvipobe.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/38763373612.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69fec4ca2---63901414440.pdf
    • http://cuatro-pr.org/sites/default/files/file/6531991777.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf55389b3---munologigami.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/781q7ou6ufd6ui3fiv07ls3bel/79103672846.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/93c65ae8ae096cfa23bc4905779cfa14/46727648528.pdf
    • https://planet-for-events.de/userfiles/file/4737451088.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35649972231.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/35e92514477c5a6628faf688581b023b/98853686525.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8l981rf9e4ihcf4o1s53r9gf63/48648612683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5a.bin
036057bfd9c736a64d4a23ae70486467943d235c88cf2eb1ca90d05a9d86782e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 5316 bytes
font_01_sfnt_off0000ec60.bin
4e0345cda60f882ffd04c27f21ee06ed32fde5f9b7812a72e66299b013dc8e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10584 bytes

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