Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cef667c30e48fcc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 07:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 528ef269a97d79ac54ec15f473ad8f06 SHA-1: 6def52c309117ab8b4a16f50f42334af9e9218a5 SHA-256: 6cef667c30e48fccc96390c40aa833ff2ce0cb3e2cf65438b52bb6b38290ad91
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ludifrance.fr/userfiles/file/35011084643.pdf In PDF document text
    • http://king-pro.com/userfiles/files/derurup.pdfIn PDF document text
    • http://alvitraders.com/files/30731445760.pdfIn PDF document text
    • https://rinducm1.com/contents//files/21859330513.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/3643524965.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lkfbhd1tvaf4omn7aakvr4letp/vaxugedakiparufobesaveno.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072241a117a5---fizabazuwipesivug.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/pijupezopazoxorabovorivu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/busupu.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/30765936086.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/buruwumoliwepebepupul.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/97514090626.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7df177171a98ce7d671f28a6ad39ae96/96358548972.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/16130045991.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/90545498482.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/dejavupuzozewav.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202181223309.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/pivanemowirerapejilalar.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/44139601142.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/41300328458.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc05f9a067---54388816703.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96ece77da---tomoxufidowidivafozelu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/91640727389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+monetary+policy+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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 10904 bytes
SHA-256: 711523ea5b7459b2562fcc5df51ff215027d2679af3c13613f2b2e5671767db6
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17012 bytes
SHA-256: 8e200d226f0af570cacc40fae77699b49f5065edf41375a26c998b54f525e8dc
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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