Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b81350deb17549…

MALICIOUS

PDF

81.0 KB Created: 2021-08-21 16:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0625728bea813c8155369d8365e219f7 SHA-1: 0ada10a11da27721e9f99860c17e7ea58d54f772 SHA-256: 65b81350deb17549efb1d76130094b0b623e6fdf4a9f3740df342fd0b3e992ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed to act as a link farm, potentially leading to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://networkinglikepro.com/ckfinder/userfiles/files/malevafalafulud.pdf In PDF document text
    • https://resortweeks.pro/userfiles/file/73037079615.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zenowavoseleze.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083db4e31fdf---telanitevonunane.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c0a269116---ridebuvurutofaxer.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50d7efd0d---benewesebojafo.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/eieriq9nj65i69krv57pfh105j/52056879009.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/53721696170.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef82339b26---kabopuwanasasiwutupivum.pdfIn PDF document text
    • http://teraval.cz/res/file/94087809158.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/loxasudivozezisepexut.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/3742014234.pdfIn PDF document text
    • http://alkanboya.com/files/file///kukelisexam.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/lizipalozivibibizo.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/susap.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235acbfaf9---vovivize.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/859ceb93b063b04e2a5720ebbac96ad7/palotugalojatexuro.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/62243763865.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/93cb94f9e0323ca905b761b2d3a022d2/napotazikiwavuvir.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/bezareburubejuzidivelu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6e6a4eb23b65107dffe8d905e64b9e1/86317933050.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/40655998217.pdfIn PDF document text
    • http://shamayachts.com/upload/file/83683580875.pdfIn PDF document text
    • https://corghialberti.it/file/51670536361.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060802023271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fr+legends+cheatsPDF 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17012 bytes
SHA-256: d6a0f29beef394f67322e29b893ddb74530a201f0da806ea1c660e97301227a0
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10416 bytes
SHA-256: 7cd58da8c809ed5ab826f9082ff38b3ca6270050b17388f241397e2ddbecd239
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1