Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846f300f5721f74…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 09:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30306c05ca1aed6648448a83b4e14762 SHA-1: aee053401b305d46271addf17ad90e73be2c7b70 SHA-256: e846f300f5721f74c3ad380619e7864a237cac8385f092b1622f44765c23bdc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=devops+complete+tutorial+pdf PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d60b78572ba---49412981475.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/71158945202.pdfIn PDF document text
    • http://honghuibio.com/d/files/89100058428.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7f4ad257---widora.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/bamulu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cce4190ca0a---38960424030.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1c0srkauthojis4b41l58b1ckf/ketopodidufojefu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/64a25569b5a457a0aee3090b4b622200/19427761988.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd5ce7c4f---tolikawenakivig.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef68e6887---josenuvexutegalasi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8c1a9f95842c7a3fa81308744062b2a1/vipawoxina.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/45587514609.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/dofuxut.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/runeleradexaropefage.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/80912497828.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xalugazewugenam.pdfIn PDF document text
    • https://coevent.ru/upload/files/98058826746.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3520750000.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/werevo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/655lnnj9hpcpe9tns70cdbtolv/84380350965.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kedafibewasofufusek.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/402edc4e374327b8dc72fb476a98e469/71761821653.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/62688937278.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1426b126---kagikixelaruw.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/14899897318.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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 15220 bytes
SHA-256: 92a11e5a59684770c74297f19b2a902cc039bc7d1d97726dffd31d693f936c2d
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 10844 bytes
SHA-256: c00b478ce17b30fc8cf1aea78c308c4bc985f386c19451827175c78f3617748e
font_02_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1