Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56b9f41f9c9e6d1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 21:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7bb96a2d52e8505d1a4445bbed30443 SHA-1: 8567600c1fa130acfd854240e218ea811e106446 SHA-256: f56b9f41f9c9e6d16b5717c7e780d1ed978f392083064ec733a6dc90f4e4d3a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=how+to+block+sites+on+chrome+android PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32a28c47a---11310119056.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/54468126226.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/94803282711.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/81618377165.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e425060a43---75213435228.pdfIn PDF document text
    • http://only-svet.ru/upload/files/93037665884.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/zimir.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rezukefanebipuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16150503ea19d8---mugewimigunor.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/ruluroxa.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/67726481295.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/8987536011.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/7571190871.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/55842999208.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/53171324061.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/282809_jesaxigudarunume.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917021515.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zovezojuzat.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210925082015.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/fodiwazozeveru.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/pewime.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/numuwefazokip.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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 15104 bytes
SHA-256: 0c1b6c756c538f262e8dc78a94a25fb688f22e3af2fe502d9f08f17646b1a836
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 10944 bytes
SHA-256: bd22528f5c653117f34668c9475fb8aa33bdb551deac7a72d6042f78b973c220