Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e8d9d38bb0e767…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 13:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 103ed67d64c49f9eb34455ac32d1cf51 SHA-1: 935437cc781f4f4ccef74c26c67b4e825a0800c6 SHA-256: f5e8d9d38bb0e7670757811e015f213d9649ab687785b0b308393950a578bc5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm or SEO poisoning campaign. The presence of external URIs and compromised CMS uploads indicates a potential for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alate.org/admin/fckeditor/editorfile/pijajuzoromaw.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3c1c7335---wekotovawav.pdfIn PDF document text
    • http://bjjiffy.com/upload/buwobivajukedobimozir.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/94143121255.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e01667e24ae2e7cca41b56f4973b735d/tufikativuwo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae5b3adcc---xurabovelokugimoro.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/394b073b16fd7d326a62b5b3770d832a/neles.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zewukotefilum.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073635f330ba---sivelimon.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/gekovezowazanoxusesefude.pdfIn PDF document text
    • http://aimic.com/userfiles/file/67190282924.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f6177fff3---temesarigiwimulujew.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/93032943113.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjuo870sr8290l6hpd8jhil3vt/mewifotuwi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d750d695c3---lozimogel.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723494a9155---zuwirero.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/68469701489.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba38cad44---6625681028.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/rulinatugerafuriniraxibap.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/zironapove.pdfIn PDF document text
    • http://ligneus.hu/upload/file/64086021176.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/lovukorumezuboko.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/fobajovi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/jefosazupopemep.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2mbu51au6l4lgqomo7san3ilov/gopevorodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fossil+of+a+plantPDF 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_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 17424 bytes
SHA-256: 32f70a56b1ebfd4953eaeec1b32f0b4a252e83db9a15debe64690378dd35877c
font_01_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 10096 bytes
SHA-256: d55e3242317f95da76cde814740af7463c8e76b61b0efd7a4d1c3fc5bf7abdaa