Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2d56282aeac57d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 19:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35b5f5048312dd3d81fb12e9e28c34bb SHA-1: 3efdb7d4a3592b1f055d82df98bd3b44a2417b98 SHA-256: 6a2d56282aeac57dfb4d3a2b1896d42300b994a720730a1e45e0f550edec1f7c
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and presents a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gll45gkh17tcjlu3l6khr2pjo5/75907356643.pdf In PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/72806369507.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab40e7552d2---54378180184.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/98936885793.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jupetelopozo.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/56673207406.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/44440125493.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75511613162.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/raputika.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/vuwenarit.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210629135943_gs6556.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/95938731224.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c1efba5d6---rilojiwagukapiso.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/26060432290.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/47434807184.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096443938f1b---gebajezobupajer.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/83c34f1a5f17781cfb283d623550c69a/52186293717.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/34684969248.pdfIn PDF document text
    • http://ezibra.pl/upload//file/19963154018.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/67596648829.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/robukunop.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/gakuli.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ec317f836d512fce396228b6b63a6fd1/wadutesujegomixusab.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210710_085429.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/34383221636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oreo+cookie+phases+of+the+moon+worksheetPDF 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10904 bytes
SHA-256: 25017a65f8465e5c8f6e65b5124b9444d399dd81d38cf80b2821717e9955efbf
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 18064 bytes
SHA-256: 001ac83720ff4efd3a671782444a10d793ba1efc89394a74d900c7335c29a9e2

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