Malicious PDF — malware analysis report

Static analysis result for SHA-256 363a99ec51dff5b0…

MALICIOUS

PDF

76.2 KB Created: 2021-06-28 20:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7f044ecbd3f09b23b302091131fa0b8 SHA-1: 4584d596614bd4e78978bc0bd46482075b782aa5 SHA-256: 363a99ec51dff5b03ef1c104d5b437fc459d724236a78bdf53f05e0b6547cc04
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://curry-box-deluxe.de/userfiles/file/50382143136.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e8a0d22241830d78d163996abdd61469/65756383299.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad14ab4c6---badibulelujasumiwobexoxem.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/88013566745.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/67cb05d74d66427cfc13fa26f6f630c5/39027216443.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/86ieqvg511mumjgo7u9r103mm1/kadaxikunorakuviri.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f1ddc2e9---74114103188.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d9cfa0bbeaaff11a91c5c4047b1bc291/mavasuxemirujube.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qssem54s5nid1bqno93c0roql6/73474351585.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/11629383741.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d5fce365---90176408668.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10448951012590d084f0b0569e2b4c28/kuserudix.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5e76a62b---40797821235.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/da2ccac9c07a3adc9ab6a77f6c471849/30649727874.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a163ed43d466de241aba2741f0cc4c30/67382563602.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xalaboro.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/86261193116.pdfIn PDF document text
    • https://diphong.com/uploads/68664749305.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/96521417024.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd339dee665a43ddc6a5ee1f747b4625/bijosorisasajakibegi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0ec9e2593cb9a1c83637c1cb55ccfb1/68112799559.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/86041259396.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0d9316f21cb2594e644dec1f6aa748b1/19370140855.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160959f9cd8e63---87793938957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+water+horse+ps2PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/28091dc9dbd00fb4540327c562703417/96759021009.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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10276 bytes
SHA-256: 331e4c6f69fb83a8c87eb04288fe067d4d8180c2fcd0b8a3494a990500c9990f
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 18280 bytes
SHA-256: 48a5f14ac5915274e8baf13af264f776ada2c5bbd05e988a358c64978b844a03