Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda75ccebc65c3de…

MALICIOUS

PDF

83.6 KB Created: 2021-07-18 22:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9c52616ff188ca9a3b6e504ddb087ca SHA-1: bc6e3a79eb0dd7b70dd1e8cefa47264b7971f89d SHA-256: dda75ccebc65c3de00d859b026a4baf9e4763610fd16c88f1b56c0829948f5c9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to files hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to redirect users to potentially malicious content. No scripts were extracted, limiting the ability to determine a specific payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://detector-billetes.com/Imagenes/file/poxowafarotinijo.pdf In PDF document text
    • http://co-wemart.com/careeruserfiles/file/2691586409.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/74035417518.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/7208686018.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5e0ad6a2---dunibafila.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c776030fc9---62122277031.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f53f57805---27425167835.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/09smge1o48bdla9bos0kde4021/13390503691.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1c905c2679ea971d4c2899a751db4d2/2634604247.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be306e098cc---42658261412.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/70055659516.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/japabilutazomam.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a510d10db5d857a48f267bcda2acd317/4916539696.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be020ddd00---32775201835.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pl3trqtgocve4f7022vvle6oua/mizirogit.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/wujasixoroxixifevug.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c91068bce---ronematevemogukilif.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/pedorerawenomeli.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/19543341886.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/resirunumefa.pdfIn PDF document text
    • https://bataretak.com/img/files/file/zetizaxarokukefe.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/rubanutugawebiwipofagi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4e83c152c71b63239af1065a268f09c2/mawatifadiwudokizudobu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d2e00dad---demokof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=environmental+science+notes+for+class+11+pdf+downloadPDF 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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 10968 bytes
SHA-256: 063c1401985aad629181fa8106d1377596f6a3d43e8463fd7af03f80b608485f
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 17172 bytes
SHA-256: e5d586cbe539e8209f1b468824ddc394dece51d093deb1548c661b6b46be687e
font_02_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1