Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc20f3b8c942715c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 08:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b92af3a805766ede1c0d6b577e59544b SHA-1: 912d8392e6b469a0a9664573706705048d73e0ed SHA-256: fc20f3b8c942715c4f6bbac5df85e0d86036ecf1d3bfc16848aa573e4295b273
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download and execute a second-stage payload. The link farm strategy aims to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pkpneu.cz/userfiles/file/tebakonapowon.pdf In PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/22837143619.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb65406f79---dudojiru.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3ef9edfbf59182bd2a4761bdcb8454ac/37719055714.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/60346647237.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d6936a3b6h3l07vn9mhcc6ot2r/39851786115.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161433d3517652---perojafakozusebulo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df019f0f7e---56845567429.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8faf32a8ac5ebf2d1b5dacb0e4a82761/131187385.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c602b73a75---30871535827.pdfIn PDF document text
    • https://cmoretv.com/userfiles/neporojuximepav.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/46549927892.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210908_A88F13CB440643DB.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161339bcc8dadb---62337109201.pdfIn PDF document text
    • http://acril.ru/ufiles/files/sebiwikeginuvinuwume.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/67965607799.pdfIn PDF document text
    • http://chinalabware.ru/d/files/87041111323.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/koxudarug.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/79258167254.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/kukupuxen.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pizuwovugokatanugitena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=install+uvc+driver+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_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 15900 bytes
SHA-256: 4f9142cd50d30c0841090a5cbf40b343f1c41d8e775c523621bc7efc9acc24de
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10480 bytes
SHA-256: 61a9c7b6044f602dce51c69dca9605d9ddd56c11bc9bb1ac51141001ebd2a0ba
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.