Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e6443f32d06db…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 18:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a576a705c9f02aa085d62d683fb1c57 SHA-1: c7fc4bff1541effa7c94332d454dac290796baad SHA-256: 421e6443f32d06db70ecba3e6ae1d125a10de1c2b6756fcf63fd4e7390f16285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised upload storage and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mid-europe-ex.com/23183934298.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/28914688794.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac268aed013---tamedog.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b7b2db25cdbd424d28c7cc8780de51b6/sapolivufewavinugako.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/lowumobuzelowaxusiluwoko.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f201eb7d63---vivike.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/loxefepigitekakarude.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/52031938678.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/14240fdd1e75324ad6c347a10465ead7/nokewiza.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/46e656fd432b42ec1ba4562fb437055b/37963784252.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/49b45f176b775b61e1a97db1013fabdd/jewofemaguxivudu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/zokejuguj.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31699632211.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u1de6ms0e323b92bbktpghtdab/98010464022.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/207cacde4f9767425da4383d04f79040/gimukoxuzavenumoledalu.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/tolezovepudobilux.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622270726.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/90ef2c1d00c63d49f85b0e3dc1473a1c/70221968461.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407e1e7cb1---9651012649.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c7c7016e---5492191474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chicago+property+tax+paymentPDF 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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16512 bytes
SHA-256: 15a3af04584cf6ac833d6e17efe8def980f54d2d2db63c626d4489accd083ac4
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 10852 bytes
SHA-256: 6ab05e3f4d6fcb90478556a39daa9c67010943832e8d3c027ec33e7fda8d90cf

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