Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff08f1f18b7a161…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 18:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31dce8b0a506083ac64b129d32afa61f SHA-1: c7ce7583b097a19353e8378973e5804eafc388e2 SHA-256: cff08f1f18b7a161aab42c756867a60369fc1545a0524917349ab00a17561384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample, but the overall structure points to a phishing or malware distribution attempt.

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://chcial.ru/uplcv?utm_term=butterfly+lovers+violin+solo+sheet+music+pdf PDF link annotation
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3280c6fb94---pivodepibejatuxogak.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dcd6b265---lukusadisamib.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fanuvoxoxopesu.pdfIn PDF document text
    • https://ijp2.com/contents//files/90284066356.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kakutone.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a471f9bb0dcea845c3087045c5cc7e2a/welukedozagiderodozodijir.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/90488361860.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/gabuwusoroli.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/54967348268.pdfIn PDF document text
    • http://otczenacts.com/media/files/12483885124.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/rb2foo56bm4p40j3qiqbdp4br1/wemofivemoz.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/28496385246.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fuxatesuvuzisutawozij.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/60707189811.pdfIn PDF document text
    • https://bachson.net/upload/file/tibumu.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/14944286213.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/putddlk6gvc8caa8bq6bqbbm83/9473887845.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/gobosobazegisib.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/papusinofafafonanujapo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/14822760418.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/gulejipo.pdfIn PDF document text
    • https://signika.pl/Upload/file/vibudelotomomuruboletejuj.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/semukexusogigo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cd7bb603c2ad34fef57aaa53679a3dbf/31473970009.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_off0000bb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1A 11056 bytes
SHA-256: 16171933e79f6a6c60d4b7ab3a6696536c6a3e1d0e723b92cdd9b15bb62f46d1
font_01_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 19608 bytes
SHA-256: 4b7469cf0467ee10fa921e76f669544e35cc0da67ecd05b2624fab5f08433339
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.