Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1aa9d27287d522…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 12:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffdb4f6b55fab9b2316f954bc51800bb SHA-1: 479de4505f2ff992ac9f4377fc16beeb6f9b00d0 SHA-256: df1aa9d27287d522462e983130e9fce6cb46d6752185a1f5e7470250266a52cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf50d4163e---ruwojasefalodalokarakox.pdf In PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/8965786701.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/58ef36c13922e696df5ca25d8866b383/pagivikirikuru.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbebb46698---gilobadonomagufela.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/9186584823.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/54151350598.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/3805699912.pdfIn PDF document text
    • https://coluer.ir/documents/file/81581749407.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/46362157051.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615053a098b57---81130749217.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dj8fl6i78emtotg9sasbtjmaj1/minawifakifaditavelagotef.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd040ca5f27056ed6cdb966e1a7a02a3/68724268898.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b418c9edb---30745785358.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/7294893589.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/pufaf.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109160025291829.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/13635296647.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/66909144336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shadow+fight+2+hack+version+apkPDF 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_off0000adac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAC 15220 bytes
SHA-256: cd88d53d43057fc139d2bde8859433d4db254a9a899daf900187a2cf2bf28d68
font_01_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 11292 bytes
SHA-256: 28ea7c24738cc13bb7f110f074ef2112f65b600e8e4a8fdf8bafa1e40ec6a768
font_02_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1