Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99e4b96d31a3aa9…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 18:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 637bab92e70b7df9c60200b5df38588a SHA-1: 4ea5c9287bbc97a0f3347cdfd46dde087bf48a9b SHA-256: e99e4b96d31a3aa9018e36bbe6d2a269715347adf2179d9603d47eb7ab94a338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests the document is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=machine+learning+and+data+mining+for+sports+analytics PDF link annotation
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/wezitosonedozedunota.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pitokudutab.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/90346901776.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/luwuzogobuliwadomadewej.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/7498797287.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/75400327595.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/4187045593.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mii5vc41uh0m6frcsierqscgpl/pofipufetisu.pdfIn PDF document text
    • http://dges.in/userfiles/file/58244990150.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gelorud.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xofovevizevanukugikokami.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/mirox.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c43f7fe66---dutisos.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/49977273480.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/powulixawegowosutixuzugi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/97426805945.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/78132779980.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/10352420763.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a31baa8cf8bbbe1cf0674ddbf5d31835/96511141818.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109050330181443.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/19001083993.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/474603db08b2c6af6e1255830cc51613/baxixexatefi.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/36925520857.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/wotuninetepo.pdfIn PDF document text
    • 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_off0000b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 11176 bytes
SHA-256: 08695ced83f8517c8dc1e11aa6ab0fc7ac37439635dc633c0a9bd608f81d9a6a
font_01_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 15072 bytes
SHA-256: 0c4764ef8966a32479238958b451f05090c1d0d412d81ad15b9d39c8267f410a