Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da4f4984cdb2876…

MALICIOUS

PDF

90.3 KB Created: 2021-08-20 15:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 03b7be180099beaf1428992e1a5e23aa SHA-1: 299f19ccf6b785f2a0e120baa95255700e82ba82 SHA-256: 0da4f4984cdb2876bfa2f021ffc0d6d2553cac21e2cc3d2e8d7c648e5239a64c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. 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.
  • 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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac835d044d---45312201518.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/fb4b2823006398900336086ddbf254cf/85659138978.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/72afb8f3ef8a28e297d75e8c51722c91/70844464565.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ba583aca5b0f0f05539fbbe11d02e121/66932917461.pdfIn PDF document text
    • http://lucann.com/Upload/file/vavemisupo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607931d40c87a---tofej.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bdce8uibs97p2saio2sv0ten88/31272001057.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/potenufif.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d06f4e676---32701818577.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/600ca5bac2fe84aa37d8201233640b1d/zevutaxatoluma.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/ruraxuga.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/jedamadutaruleponomo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01c9fe36ec---tobebagimubamoworaxati.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071413aef809---28672781701.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/86571238524.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/1619860738.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c147b1f69---vuvosoxiwobazogonogigab.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1e0b560f966e80042eac5cae06f486ee/79684613326.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f7a4afb8---96421566099.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/72946935231.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/kozokimis.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/diwusuzojurerazudi.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/rerar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ejemplos+de+transporte+activo+y+pasivo+en+la+vida+diariaPDF 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
stream_008_off000127ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127EC 19000 bytes
SHA-256: 604d4e717f35c511129393a09a351cc488e70c959970c0bfcb11124c8164674a
font_00_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 10968 bytes
SHA-256: 4410aa672e9cb6ac7db4c4ab26d9426c5d83d13a2cbacf68f689bb90bff81f37
font_01_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1