Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dea8ff509a9d6c…

MALICIOUS

PDF

77.4 KB Created: 2021-08-20 15:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1061ffd8461d4bb8ad43df0366c56071 SHA-1: e4fdf3f8a7cd5c560f44b1a1f7391b522591e7d9 SHA-256: d5dea8ff509a9d6cb17d83cb4ea11806bcbb2eedcdf86d6faea70f3fde631394
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/79e93f9ef93342dabba29ea49d49ac91/33800526164.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2tccd5kg8jkt60tk0prsrhbabp/30761325716.pdfIn PDF document text
    • https://stvorki.ru/files/file/55945055314.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tbli9oq4aluvl35jsc9tnq0bar/sekev.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/miq40c0igfhc0ud1ums4te8nb1/negegisepupejekubo.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/wakowilowufiwe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/52648292166.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/61933030243.pdfIn PDF document text
    • https://alutat.com/data/file/89830554963.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/23270790301.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/kowuxifojezitokani.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/44878301404.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b3e897a0d7456973e9eed34ab2966b9e/4276198508.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/29262f1e686a471daf8e8a140f9d53f9/fekutujalive.pdfIn PDF document text
    • https://themalc.org/files/file/namosumakevufutipesotodin.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/34798553958.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/13146799587.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/64750207549.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe9ed7a33---62606235881.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/dutetabemajixobo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee7053c7f03efbbde7102b30d9fa3d86/zufemupewaxekitadap.pdfIn PDF document text
    • http://lukinserv.hu/file/20788524347.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/24580311207.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37561e6d0---jimifugasun.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8dcbaf5a362c9f55e10f3e1f7f1b64fa/32755912254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pasos+para+hacer+un+algoritmo+de+programacionPDF 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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 11060 bytes
SHA-256: 08a97c882996ba40f17aa573dd9bcfb9b988f802f37758c33c66b5a3beebd672
font_01_sfnt_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 16000 bytes
SHA-256: 7e9962c7f68381ac3120cb49453918b31feba0fa900f5c4eff7c58ff8d73426f
font_02_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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