Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb6fa463c3b4780…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 08:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66994b00e9ca55cc42bc6ec048951a15 SHA-1: 5c87b71dba4d1b002d773448a13df295fa07eb02 SHA-256: 5eb6fa463c3b47802f0869703fee1e8f14da83570664fb1731dcf30a320391f3
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b644e7532---nedax.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/mejuxaxamoxijine.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/5146283909.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e0a4714d---594396516.pdfIn PDF document text
    • http://www.og2c.com/images/file/kudinazikobakiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a844d2ef5---26392449444.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/sororasejawilaledaduj.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/rilemejosurunonevodomu.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16658281838.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/39612718149.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/luwosekinexi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/filuwufopoke.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xadojowap.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wovokeg.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372ebe7a40d---44370716700.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/vefodereraza.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/39406133706.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/28202180688.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/10884117216.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rolix.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/70255662418.pdfIn PDF document text
    • http://grabnerestriche.at/35935247377.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/87942166125.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/lezudizuxelifugonizag.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/gutem.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+apps+are+necessary+for+androidPDF 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_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 18820 bytes
SHA-256: a7f9008daf9caa0f7bab9d4e93501d3d6e660e459fe47c147a138058fc337663
font_01_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 10776 bytes
SHA-256: 265e590eec20121a3e3b0eb8d34756a070f3b9cf233753753321b0227f6ed843
font_02_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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