Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1e7f08acea2500…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 13:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b6f3d785b5a8e162c6c449d29e43f04 SHA-1: 2c71b21e59e3e6576142033776875e2a0cf2d169 SHA-256: 7e1e7f08acea2500829d931e84723f1ad43a66a94559839d6779d3ff62480f71
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://vilnius.cvzona.lt/resources/img/files/juzezalapalaxeb.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/19422091680.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c1a6d21c9---fawax.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/06b6d90d553fe1c6a0c9ec9bcd29bdd5/filokubowil.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e431b4a8046---velafovulosijevepuzidira.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e886285---xirisomo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/piwagoxumisavixedikegus.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9699242a7---54157462015.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/mefunavosilu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/64975272041.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/78911981786.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/takivepiwotodu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/8146828929.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a760cc763f184deb67be720b2b067ab8/49134159897.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/gemewuwodotawirenoreku.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/11727461811.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd3e13e20---69528195018.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/juratedisolirazuwab.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/nevakuxufiwifesi.pdfIn PDF document text
    • https://mauspro.net/upload/files/motajorap.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/568441311.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/36973725537.pdfIn PDF document text
    • http://eternaseguros.net/files/files/giridu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/17453554170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=prepositions+list+and+their+uses+pdfPDF 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10696 bytes
SHA-256: 66de84d5d0ba474fbdb3425b30697d5801d676481ac33bc2482a087c73bd7ff3
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 18104 bytes
SHA-256: a725310ffc1e67933fd740cfe3b72665549d7c4fa355c57fa6690077e2187d8f
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1