Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e18cf685eb7486e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 08:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 705c11cf0f71f5bcd2f973a8142677b8 SHA-1: c185f809e300c1aba19a2563fefc6faad1aaefc6 SHA-256: 0e18cf685eb7486ed2b66169b423d5207ef302e9ce203c4d498a81c75ce868ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially inflate search engine rankings or distribute links across many low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=record+system+audio+android PDF link annotation
    • http://autohondl.cz/userfiles/file/notum.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/43980746626.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/mofomobug.pdfIn PDF document text
    • http://splogservice.ru/content/files/bigokosisuxov.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/4422870097.pdfIn PDF document text
    • http://hkwwta.org/userfiles/80261726621.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/68247940032.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jaduturugiwinaliwajapaz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8vg0prj4d0s5oh4uc9042ntn1/85108160289.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/jaxodoridejafivuradizutes.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390dd006ef5---zanidapefikepixuwigasu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca019e733---83986384770.pdfIn PDF document text
    • https://cooperspick.com/files/83699047614.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/9962901616.pdfIn PDF document text
    • http://bushurov.ru/images/files/99015055955.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zovawanesuzolavomemi.pdfIn PDF document text
    • http://goref.ru/files/file/jabakizidabosusi.pdfIn PDF document text
    • http://klenderbio.com/upload/files/nukevo.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/29775930795.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/90865854958.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/1554850730.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f71e17101---likemimenido.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/14302487743.pdfIn PDF document text
    • http://hingliltd.com/userfiles/nifubijewigifidufodutib.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/97234638257.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 17120 bytes
SHA-256: 5ae48016ea0d408378f285967df5271d1353792f8d571e879edbe889be8d238a
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10744 bytes
SHA-256: f884fa84c33bafbef58fd0f690f879a83aee6643310ef908b08f85484190e824