Malicious PDF — malware analysis report

Static analysis result for SHA-256 466e051dba253acb…

MALICIOUS

PDF

91.6 KB Created: 2021-08-20 10:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: e5444d6f3f10453f30675a2f3837c213 SHA-1: 31e913ead8413bb92508d37d364b1a3c30ddcbc7 SHA-256: 466e051dba253acb9cdb67cd74f94e82d3782ae94d09949a9bc81c44e3183a67
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=active+and+passive+voice+worksheets+for+8th+grade+with+answers PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9545949a08---jelawisu.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/6225293205.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097449820acd---kalujafedixafuxip.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/69699876088.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d48f5ce316---vuzagafobudeluzolijen.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/94647887173.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be63e23f2f5---39336910983.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fafvp3q9dq4u4cnp0im97tq05/kugux.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/10986066613.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d269c24990---ladaxogozewunasokuvadefov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbfd5b13466---tovomemumotubipelajefu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/64532378343.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f300d4379763db102359aa38113eb23/wefugizaz.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xijinazagofafisoj.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p1fagg8g0fqaafk7otdtdtear3/53875332675.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e5ef4bc763d092be32747025098e66e/kakofixotalobaxupuwug.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72db655fc---60072249503.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/054d58cd04cfaf3ff369b6585c6bc826/75692925431.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/78715204333.pdfIn PDF document text
    • https://avenue102.com/uploads/file/84322848405.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/64014059081.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fdf612e11642c328cbda631825ee2209/xulozozilefufaxerotazikox.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/39858453263.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fe34fb7a84a287418a7dbdab862d9053/gafokefima.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14766767359.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_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 17828 bytes
SHA-256: 383bdc2b68cb8cb0d92e6205610f1f75be4fc66adba45cb1d265466674c2bd52
font_01_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 11284 bytes
SHA-256: 11b70ee93861ea37c2c7d29e588c1cd8699e73497b293b84fb4054f993e53d17
font_02_sfnt_off000146ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1