Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed5701ed354826a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 14:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de0fb96f314bf98d8f5786efa877a853 SHA-1: d4b7b608bf0105a70d3370b49dcafea56392f005 SHA-256: 6ed5701ed354826a311145e094952dfc210c5ab237e013aee59c783d8a241361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=exploring+creation+with+physics+answer+key+pdf PDF link annotation
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161327829585d3---76574889569.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/rolobokegibizaxakosadav.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gg2k4r5uadtdf8og1va190vgtm/85382201494.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bizexaxirutemiwarofipa.pdfIn PDF document text
    • http://rayanchem.com/d/files/vawekasuduwepeza.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7915dc757---bajefubutefidogamikujav.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbc245380---doloxajariz.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/50320157050.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/40457804408.pdfIn PDF document text
    • http://sial.pl/galeria/file/xuxilugugusozidifilalimul.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d63c91d0d---bedawisixapaluruzuvax.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/169af78879c1c3eb98f72b4c47b4f84d/73352426402.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130551107d54---2517278247.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/dexavabub.pdfIn PDF document text
    • https://qnzar.com/files/16047801941.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/95096361222.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/fapaxeminu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf4d221f7---zazunujoripajafetepez.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613637b6c4b1f---kosigoborawatexem.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/99699179277.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/dijokijoxer.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/70877607329.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rexiwuvaribul.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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 11276 bytes
SHA-256: 62d07e0825cb67fb9a1032df063d8a863488947bbd503b6df7e11eb4d7b04fc0
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 17556 bytes
SHA-256: 4b870c1df631ca80852ea1209f379baf6c17ecb7725f303ab5728b02510ef56d

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