Malicious PDF — malware analysis report

Static analysis result for SHA-256 c934f376b859af4c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 00:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62e6c35ef9cea727a9959f7fa4e75a00 SHA-1: e2ff72e37f838ca244811e7d7e24f65ca07816a7 SHA-256: c934f376b859af4ca07eff504cd647f1d8f7ab30287f8f1a63e025d4c6bf6eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://resonanceacteurs.nl/userfiles/file/nufezudije.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/tixovizitarotixivina.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6f58b1c73f05e7318bca3b7e4d42ac5/5792363985.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/59402536410.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jedaxuludefiwolifemezapi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/lugafun.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baf894e6bfa---wunaz.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e259b4fc76---kevifodeduma.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/loxovafagidefezevozes.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/rapujoxakopevitoratex.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8cdsm6k49qlsml1diaglln4rqr/tufiwegonunikelemevanede.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/69573942145.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4279798748.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/13958004604.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/60825855988.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad032bbc359---kananamasatejivof.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/38sc6nmudshrn69bus774jhsfj/narikaduxulimufalizamox.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff892a846c---99606593634.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5d8000e8ff7fbff360b22233d66f5743/66166598272.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zokumamadase.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191e946e25---fukamotefatoremavageg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ts+driving+licence+download+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_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10812 bytes
SHA-256: 71ae866b11d7f014b953e84af81dfa9c468192fc705e0cc0b722a20cd4285d47
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 16256 bytes
SHA-256: 582f9be527fab22275463ef4d4260666aec490c099a0e39b9ed7da4ba157d6ef

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