Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f4539fd1b738cd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46fd8dd2b7cf1ab4c55669f670266d6c SHA-1: 4a9cda102b3d88c83dcc7f7589f668c80490ac70 SHA-256: e5f4539fd1b738cdbe95085c1029d95785721bd9f9468ede275a9b8811196ecb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics supports the conclusion that this PDF is part of a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kangs78.com/clients/66216/File/87389307968.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ekvrfffh1l3sai9cve0lmufvl5/52320064380.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zebakawulusazuzib.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kepoguravesatinalixodid.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/70397502728.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/81086434731.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f5644eab6a8---migitoxakeki.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/76362476319.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/11146933148.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/24018088020.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8805ba2f12---vopepelarepipazubujuvato.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/kafufap.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5d0d22c18---71204019523.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/bifegaxopuzejajazufele.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/barax.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/280ce79bf51a9e9f6369a851ad163fbb/sojafukabofuw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/51664554288.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea0f2c2a3a---66641798015.pdfIn PDF document text
    • https://nistd.in/userfiles/file/65339717480.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e2a1b737fce8045ddaaa346d99f44c32/votokilodo.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/50116832765.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ep44dednhlqe4ve5gh9g4932cm/67606335943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ss+rassenkunde+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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10400 bytes
SHA-256: a697c1eebf4f010f3ff6b4aa34aa8f9b08f978092dde8e10b9436990857719da
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 20536 bytes
SHA-256: e50dd5613fd9fe09271274caf8e2559a280fa3753da864ad897666b334fa8d5f
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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