Malicious PDF — malware analysis report

Static analysis result for SHA-256 09646e6c11ce4e62…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9cd46ce266fa3c4c78c56e06d45176b6 SHA-1: 209f2c19c0d23eafbd771762e9a6efc8d1dbcccb SHA-256: 09646e6c11ce4e62c9166345d9bad1cd65ca5af05172698851927025d7be9b52
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/52117410489.pdf In PDF document text
    • https://institutdesante.org/userfiles/file/vifumimijuvitivabutonutag.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/zulokazeguzaguvo.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/woketezalisadudironoruf.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xejajireb.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vipow.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da29ca0191---17389799528.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vikofota.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/durenu.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xusorowujozukatusixawin.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/wigozixukasab.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/55745084594.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jubisibubotunabexodoxav.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2885c2d1228010133595d5e9ed82b796/31186812213.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56116963169.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/tiworarupewevavunudepuv.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/2407880308.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/29688485937.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/60325122234.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210905152830.pdfIn PDF document text
    • http://orem.mn/uploads/files/menariwifubegisitoja.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/ninogejexerazux.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2tv93dpcuoiegltbmpsbtjilel/47042256028.pdfIn PDF document text
    • http://dsagco.com/Upload/file/34454052793.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/1868463535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=auto+spam+androidPDF 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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 10456 bytes
SHA-256: 523475ac0e8300337525d3b2c47c371a40c666aa1c40acd7bd3a85ce2fb1e055
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 18916 bytes
SHA-256: 945e0a1bda96262354416748bbec328a608783116e87873f4ac3e0db32d89b11
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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