Malicious PDF — malware analysis report

Static analysis result for SHA-256 c769a772885f7d82…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8df316e3b2ce6352b35934ea4dbd175f SHA-1: efedc3dfd28991752da58f91cb46507d448a8276 SHA-256: c769a772885f7d82592db36fed02c027858ada0d729deccdafb6216a0c89ce7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or appear to be disposable. Heuristics indicate it's a link farm designed to direct users to external content, and ML classifiers along with ClamAV strongly flag it as malicious. The presence of numerous unknown URLs suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://burkina-businessschool.com/business_school/uploads/file/xidokogorepinono.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/wurodibijanokafizexezu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0c5c92f4---xidarituwox.pdfIn PDF document text
    • https://coevent.ru/upload/files/fagopunixofaduwufo.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/95526720576.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/74017137750.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6824087d---56500828573.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/labumogijebizafen.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/22958614144.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/tipodajudefofi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gotujamosuliretegabuk.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/62604019856.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/texadezexe.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/kabidajobukekobexubururo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319027912e3---jarorofofuranapumazoxalid.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/kiveviloxijesi.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/6540628406.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/pugorekuj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ib1rbtampqmlobr5jnsnsggi95/zitatuxa.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/71545771966.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ad096bf6---zopifujekavegikotixepo.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/sakeronipevugut.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/8596023194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=karaoke+pitch+changer+mod+apkPDF 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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 10828 bytes
SHA-256: c44a51534d6fc89cfec4426a79582e7f0408309e1043460802bca81d6ae4f199
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 15424 bytes
SHA-256: 1a7f5756fc2e8e22a227db5c3240fb50d8cd6430b257e4b3be69bebd31370478
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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