Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7416b5eb116da7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-25 10:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce2aa6dbbae56d38deb14f3d89990d66 SHA-1: 406d8bb14e35b70069e832633e77366b0466b5d7 SHA-256: 4d7416b5eb116da70a706e07e64ef3e87219756348dced3282b5372bbbc5e2e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6fac5c206---32521271910.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lvpt4fimq9j1v38bsj36dabpri/gekudaligumidaropudija.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0c49039f1c0d4d4e37071336c8a5313/68053610037.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/8462125a9cdac5c650b97cf42c972eab/nevunematavidopu.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/punedezopoxafodegubu.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/30242694576.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/zanenevoxezevobomakiz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328fa54e55---poxovij.pdfIn PDF document text
    • https://castel.ro/userfiles/file/kaver.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9982005e65efd1ad896afeccb7638d34/32070049079.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb066c7b6ac---52224363276.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/vulupajoperavexawejusokep.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a22c33b75c2d12f5e5d8daa4f5278262/66897682062.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/nixalojilagu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2pchjri2ob434k3j4grb4d6ai6/dexaxopupuxi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3e58dcaa9be6bbcb755614d216704fd6/51318725719.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6f482f2a1ba3c11b3b7320ec6d2a1944/78333370813.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/30521890909.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9og2t8ctelbo735b6iuogv0oq6/57219040270.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vojipuneriri.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/54080435426.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/8c39aa9cfd2e2c6a681d71d759c9dffd/tuzovoxeneloko.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28601181890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+human+centipede+3+full+movie+free+onlinePDF 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_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 17076 bytes
SHA-256: 686b65310b3115a459a41027f129f1db75c4351875f47330207da5fc0421f7b6
font_01_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DE 11020 bytes
SHA-256: ab6279eaedf52e2a46db0bed74680611f393295fae2d4384a4dd77a672702a5c