Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e200e34a357ece…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1788e85e8fe5bcf9c7e04ba4ec37d224 SHA-1: 91ca727eb6c0c9252452074089709251e6ca8db2 SHA-256: 21e200e34a357eceb10b1161a0d5c528e9130c6d28682f44cd7ba82235ea709e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The document also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=digimon+world+online+android PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d97bf9b7---76218913743.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kenipojixonoduxusarin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeb4dfac3---78275794816.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/peribodowodekovi.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/14824278015.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lifuvedusatutukapu.pdfIn PDF document text
    • http://banquat.com/userfiles/files/94056495234.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/37929022634.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jimuzokopujusapuwi.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/vomidegitomedovamuxuto.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/19646843781.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/tokope.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/35237001571.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/71943319121.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/30628372478.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6143d3d33e034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded1c50aab---dinemaxotazitekatavetu.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nexumapotazupifiw.pdfIn PDF document text
    • http://leton.pl/userfiles/file/1294205378.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/mujimo.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/28414423564.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614082bf1299a---37424787660.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/duwijivasatumevopemige.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/xikafusebolonaxalez.pdfIn PDF document text
    • 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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 10412 bytes
SHA-256: 0f95f861f1ad3c43ec4df266801f193c1bad997259d65f3403da43a4cb04dfb8
font_01_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 16296 bytes
SHA-256: 8935d13c05a324b23ce1e005d4b66ca050e372d85c64b1d93de32ef5f0745f68

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