Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bc0a9b6630a682…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 00:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55e89dfe70cda97a85c885b5e77aaba0 SHA-1: 694a2742680c6653adec6f5b34afd751576d4a29 SHA-256: 40bc0a9b6630a682fd21bb032dc2647cc0b1cf9ec65b662aaa95f51efdc807de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, such as http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614487f050437---mozigemamawizuzaxa.pdf, are likely intended to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.asiacoservice.com/file/files/dugalolemofodugoxotafebi.pdf In PDF document text
    • http://rund.cz/UserFiles/File/2563571837.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613669d6d805f---42490939698.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/49805920205.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/97213064810.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/54976091182.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614487f050437---mozigemamawizuzaxa.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/petavovopilutotakesawux.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/35473823580.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109011911147333.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450864b32c6---40955994562.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/18271350832.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/19507591841.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d509447ee---pafisi.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/vasekoridof.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/mesawodijinu.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/bikewujarotirugopunufufak.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/lebekubofugufekus.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mumunat.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/25136713802.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/90178290478.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/bivurovinidavazisijol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mod+mobile+legends+bang+bangPDF 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
font_00_sfnt_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 10528 bytes
SHA-256: 6fdb4d0664b72cee4ad49657fb9967ab1765e1cd3272d2b8e3ddc0dd6c662e9b
font_01_sfnt_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 17432 bytes
SHA-256: 8694da9c71db10998d693cf3975a49b80684735f6b3ccfcd6d3d3dc8b13fe967
font_02_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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