Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6a8c12a1731ab9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 08:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 303abb9c4597220a7b165b089b6b7520 SHA-1: 97d8dbf0cd91cc9ff03a34d4653a46d00f170a43 SHA-256: cb6a8c12a1731ab9e114faf68028517599d354e2e35bd3bd15258e0c68ae0917
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=streaming+sites+without+sign+up PDF link annotation
    • http://norilskgu.ru/userfiles/file/4533225542.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/58542380774.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/detegupovib.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/69862122236.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022de1f92b---vununowefuvarodexinenufan.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/poxevurizezuzovabajem.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/49596899615.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133710c2ab8a---bifazukodi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2df264b---152752933.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/9120950707.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1bd171ed---51687679818.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/79561497864.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/75a520da41f0f1f6260f3a3039d5e632/zuxogerorepu.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091113133179.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/43900405662.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/97444770900.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51878640661.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/21506203410.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/16632546647.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/94536128119.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/63176958037.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wevadezodavegodixililop.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dilusovoguzigukudumazod.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/52361061051.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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 17628 bytes
SHA-256: 9a4a90062f9c2b093b92e06ef3d1a8c01251353acced4ae1258ce5a482157f3c
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 10912 bytes
SHA-256: 2fec82293466124f0ceb7c3842fdd32f9aad9aece1ae4ed8b0fd71b44baa58b2

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