Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6154725dc1dba0…

MALICIOUS

PDF

75.9 KB Created: 2021-07-21 07:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1baac2e02c7ce82342c6a98319d3fe14 SHA-1: c4bda7382221760d774a11e33c8bd29f8269587f SHA-256: dc6154725dc1dba0d06388b6857da678d9754d9cd1ce55c56cda58b0e0fa812d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://esoftland.com/userfiles/file/77241970335.pdf In PDF document text
    • https://amd-export.com/site/upload/file/zibinixenumiwigeb.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70639019965.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608401cbe2dd7---45343422944.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e2e7debd9---xomirexunijafe.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096adc1378cc---79461610549.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/32136141691.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/fozumefegaputa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cnp1ite88id5sjc7k7tlito233/povenufukuluxefi.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/82207612972.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_C1A93F6A4012FDB4.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/misejunegulofa.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7fe875a3---24995230254.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/27e694bd8f5f3c0dc368606104ab7e92/buzesovagetudibamabux.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/lodamutejasazunuxage.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5ae85969---wamomituxid.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e7f957706163dbb1c9085cb2858567b5/18363565021.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210623152705938311cz4du3.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/14536446412.pdfIn PDF document text
    • https://nadamasristorante.it/file/39814546043.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849ecf4e9d4---97435676424.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1i9656q1tt8bvn6nkgemprn9ts/19514410280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=common+entrance+answer+sheetPDF 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_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 10476 bytes
SHA-256: 1d088fe99a31fe4c25103e4a367f34507756fdc1633e54b3831218e05ce8f81c
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16340 bytes
SHA-256: f50b555628c24aabc3b65528f65457c94978fe17ba0c07c24b52cbd1ba32f9ea
font_02_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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