Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ca17b68e9219ec…

MALICIOUS

PDF

94.3 KB Created: 2021-09-03 00:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cd1a8b7190f41b610f2fa94a0f9a755 SHA-1: c8fa46451b3740f39cc83f3f520d252120fc87bc SHA-256: 26ca17b68e9219ec57d8f2a73f4077dea1e2a6d2296a374f0ff681bbd9f4e672
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=jmeter+tutorial+pdf+espa%C3%B1ol PDF link annotation
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/20688ffcbdec2d3d93293abca73a693b/soxakif.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/67607742645.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/11254644969.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/gabefewatudu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/efcb9aa8f4cd1c552a786089b1386fb4/jitabivi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627155208460.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1de6ead8938af1cd6884e859ea5f0f32/77679129115.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tmbdqr1c6uu5j5d98atsf9kg4/zoxupagajeti.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/78941865119.pdfIn PDF document text
    • https://rotitelor.com/contents//files/60366672973.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/60614361288.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/redixorelubapetivijedob.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/47ne73q4d12u5fqqdduiin9qqd/labebaxuminiz.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/6586631795.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/36927502886.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/daxedejuzaxoje.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/resefi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a30cb48b6---61697970317.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a48e570b6e31a649a864bd000076830d/kabenafa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/413b768666b5fa23e1c6aa99fcf1a715/lopuw.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/319420142d86e65f6f2ab533c164dbaf/66198746211.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/gofevobopolenimuf.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_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 18608 bytes
SHA-256: 83ab1a4efa3e8d8f00bcf1e08e0327b84d95f2d3de1bcc68a06975fc9cec4235
font_01_sfnt_off00013840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 10852 bytes
SHA-256: 5d59ec8b26675bf953634ea6a3b4036604e4d57d77f91301f6fcd0734e28664d
font_02_sfnt_off0001513b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1