Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f133bc30f0cb702…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 20:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 388ad0fe6a87e8b9d12b662f1e4da39d SHA-1: 456941bd4519503854310bae806ddc3fa5953b39 SHA-256: 7f133bc30f0cb702c12ee626d1ca29ac75896c668778b7dd7fe6f6af5626cd4c
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering tactic by luring the user to install a browser extension or update, a common method for distributing malware or stealing credentials. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious download sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=adobe+flash+update+service PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37c2996b18---54808303980.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1daf6274f734742bdd1c35abe7486f27/xulubejixopu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gekanu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab28b9e06---lurujinojuzivuvasigonopu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a517a7ed302---rinaripifujefurorij.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/62365529798.pdfIn PDF document text
    • https://menu2uplus.com/images/file/92304221480.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/11110895999.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/dejusuvanatizufakabagi.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/nuredikoret.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/goponafurirolulara.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/95083596690.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d1ee86a2---52058098183.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/2106284947.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c84372d74d7d5be3452ddc8339a9f191/kesedobafujububolo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d18f398bb513a2c28385f9b74ecfc260/boxegojoxitakek.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a22b92c433cde2c740c789e4b506dac2/desag.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/lifoj.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/69439501650.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210713091100.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbdcd69453---bukunexuxubato.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210531110352.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_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 17272 bytes
SHA-256: ab7e910cc773f36fdbf4013d7ff1c73e1ad4a22ea73d6cc5fb86683dc3e109ef
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 10900 bytes
SHA-256: 22a4c6b6c7a0c4520739584506f70ca2073e58132d8406cf534483d1a0def223

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