Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7683282f78441af…

MALICIOUS

PDF

166.0 KB Created: 2021-09-02 23:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 290db1d35ef58bb6cc8b47d319c6ff64 SHA-1: 356fe0e5b5fd21b4ead5bad3bb272bdf205f186b SHA-256: e7683282f78441af7dc055b7211bdc6aaae0bfae0d4c882b29d523dbeaa3970b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external URIs and the nature of the heuristics strongly suggest a malicious intent to redirect users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://ozdesignhouse.com/app/webroot/uploads/files/natulujadivine.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/eg9m49rq54vt8m3engolj7m3o3/korugegenuburijajeletax.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/gokarefepunikeri.pdfIn PDF document text
    • https://bdata.vn/upload/files/gutiduzen.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/21782103062.pdfIn PDF document text
    • http://philboyd.com/67048780435.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3774ce96---94163889407.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/xamizidov.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/gavemopu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/46884172070.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/delusem.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/37668012133.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3e347935fdabb4bd91e73ea600654aa4/vevimubewagunexosu.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/76654333117.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nifegesifumanix.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/maleku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772f777c355---mudetemupazofasokaronur.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/luzawe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7afdfb65880928bbaf63c7a93f04ea0/32562435262.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/todejekigorulukasugu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39515905150.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/dosiwixovin.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xitenajakavote.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/pezatizovapapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=streckennetz+berlin+bvg+pdfPDF 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_off00021c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C3C 10780 bytes
SHA-256: 188a09b924e55e398551ea4c9f5ea9afb3e589d655f0850a23697a03ba9941ea
font_01_sfnt_off000234c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234C7 23856 bytes
SHA-256: 05196a5df770955c7ae4e4005bc92cb97e20d8f87f1e0fc0879a9510edfe319b
font_02_sfnt_off00027035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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