Malicious PDF — malware analysis report

Static analysis result for SHA-256 f959e57b93c685f4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 21:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15f880f28c11063a3e5dc10e7339d7d6 SHA-1: 7e57bd855d8817d9cfb4676eb4bb72b7e7ed3314 SHA-256: f959e57b93c685f4cf18b7d4e30504627bf54c9d04ebed66f1a7036fbcd2b0a4
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised websites, indicating a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://americasbestwingsbeltsville.com/uploads/files/40872394442.pdf In PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wesejejesenuvilojikomu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/35056995565.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc41fb9938---16002133289.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/bowenedi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2623e328---90875260079.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/xejovaxuweta.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/9507199771.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070152def469---8789352913.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee35ce7937---noxesanapawenetulag.pdfIn PDF document text
    • https://icbacademy.com/upload/files/23608083870.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608190bb0cd35---46925897731.pdfIn PDF document text
    • https://cristalensi.com/public/File/lopiga.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/mezadifurexasokufe.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/70683403659.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f70ada9642e5942c8d48043d72a58db6/32440540752.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/bawopasorevowivorigolapoj.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/92894397474.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84f7d2c83---bejedatafiladobimak.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/23179151504.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6cafb27b5274c6b6e609f26330c58512/jewuxidemijuludubajek.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kerijilevovavado.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f595f9e8---14383074657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=integrated+circuit+design+book+pdfPDF 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 17704 bytes
SHA-256: 454234145fa2e6b34106c9b8644e3ee69e01c19b4dbb63a2bc10c38f5a3a9932
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 11032 bytes
SHA-256: c8ac3d26aa5719674fd0be2d69befed0aed6c2eec1c787fac60b2a4da1480953

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