Malicious PDF — malware analysis report

Static analysis result for SHA-256 2512a9136d99be66…

MALICIOUS

PDF

89.1 KB Created: 2021-07-10 06:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e149362003d7925ec20a38aa698efed8 SHA-1: 23e1ad0937a9ad6859cc4fe2955a50ae2bcbc8bc SHA-256: 2512a9136d99be662615e61eea18a91bec1d39c155144e58718977cd9813b06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wagnerpc.com/userfiles/files/77206256773.pdf In PDF document text
    • https://happycolaborativo.com/uploads/files/dovipogexijexurodu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea72ecbad---rorekokob.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/zamowedokibonabegudad.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d85ade5cfa6---80135831523.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dda02971a2f86e132c3b82d798265953/93456544378.pdfIn PDF document text
    • http://m2m2design.com/userfiles/95962647547.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/fivunu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160971837e60d8---xowomanufemekabejizojola.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987fd182d7c---15002756051.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4d19c497---91824204589.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608658b22e339---79229902163.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9ae32799---joseforurexaluji.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/49122642947.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/menovi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jagon.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972c6c0faf5---dufataxelugazuw.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62c627082---84675492712.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nelalowebotenabujudi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlj1anbtstsj8tk1gktsiomcn2/90886600921.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c370ba6d---fuwuzapokukaropoliw.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nuvunojazituraxes.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/78226580621.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/009e09f578b9b6be2eaa32a113f2f871/wesaxomewisulidezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=in+the+beauty+of+your+holiness+in+the+splendor+of+your+lovePDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17556 bytes
SHA-256: 92010a9d7664f1454ef866f18aebc83a3f5648dc00b7f3049545f4744dbb2c8c
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 10968 bytes
SHA-256: 3d5cf4ede4e7efbb14c29a7c92ace79126b84d891712d95f89aa79717c2586ed