Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c92c67e8d3902ef…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 04:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6dcb8c8baeb8cecf4f29a3997d43006 SHA-1: bfb61e725c48e2fc79febd101bead5cb475da2b2 SHA-256: 4c92c67e8d3902ef635036fcf9f6d68bf17d5578d00c79ef3adbd1b46960f846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ekonopuntos.com/campannas/file/46948116776.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db191d305---nipabejado.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/75524359008.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/woluxizopasapusoginuv.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/28bad5f8233de6b97aa686c921b7a794/24785307090.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/5106415202.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sokinitopason.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/50ef9014609c97d5a08cec2da7394342/50635015918.pdfIn PDF document text
    • http://ubest.ru/images/file/64999610430.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5635b8abd6d61ab4987947ae40fa7e7a/23741765224.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/malewudekiwo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210704233426.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e07a193fc---tujodelegidelevo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8811bea8e1493bd596062103b437d3a6/tumupotufapifiruwa.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/jabizumotilif.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vapezebokegodojigegivikud.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c34b1efd8698f75593b393988be18782/gafejolotupedi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5c679dcdfa17cfb2b0a1a8f494baf5ea/dunanafokuvi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2f676435618d643fc6194a425a185e48/17665375866.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c724928f1c7---88974882090.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/53388311322.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/duxipanoliwagidepa.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/sobuzof.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/98179269098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2d+geometry+worksheets+grade+5PDF link annotation
    • http://irodori.kir.jp/files/file/nobirebekufoxujituki.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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 16540 bytes
SHA-256: 7fbe4bddc1fcc95f8918c9de90bd8b64145d6d58756cd698eef8f0ce3728f8de
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10900 bytes
SHA-256: 87ca99b86bbe3dc0498dca72246eac377c95cf034ec9b853fa70539b25801823