Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cda661fe7831f57…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 22:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b037377e7493ff28fddfc46138bc4471 SHA-1: 7354d9bba6d457b9db9d5a11f31f88324c8931e9 SHA-256: 2cda661fe7831f571be01068a126e0e477fb94c5928e884ed50e9eece7c2b5e7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bixenony.com/userfiles/files/pagakejit.pdf In PDF document text
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/46527557855.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/lulasaxutetoriserujuxod.pdfIn PDF document text
    • https://bdata.vn/upload/files/xupedilozegakadusiwugosoz.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/73193306976.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/zixikolidenopetizomebero.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614521edafa41---neropokinisopo.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/98646520583.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/danalibanegiz.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/pobosewopitaditonel.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fuzoranamorebabe.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tinenapik.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/44892784854.pdfIn PDF document text
    • http://domuran.pl/files/file/vawuvug.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/rapefepepodonofuwa.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zupag.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365d69057a4---62769051992.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09a03c875---sawedi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/34235933342.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/danakiwulojewuvotu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nifopuxanuxamusozutogo.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/37771615914.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9307d7ee---94996733594.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/86378587349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=theme+pubg+for+androidPDF 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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 18828 bytes
SHA-256: bc0243801a5795cfcc128da4929fb0fa1de00e968685fd7ec59a7cfc484d75a3
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 10836 bytes
SHA-256: cf4664162c158441ece7e49b44230c5f70dded05b4ca8c31c79084e56a06410f