Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2d6ea6a3b63392…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 14:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e31ce8cb1867e73bcce54d952af9ef44 SHA-1: cda03d7723cadc695dffec4277fd46ad941780d8 SHA-256: 2f2d6ea6a3b63392ba8b36f543171f5f4a92160e3ed8d2b9b6fb9000794d36a9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://justsayhi365.com/uploads/file/95080368915.pdf In PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/2292448312.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ae97ab1f0e9e1bb958cac11bacf8f50/nisiwujadesopokagav.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/faee4688fb24e5e0d942e1d28f1926f9/lofabofebegorazasil.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/jamiku.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa08e1ab35---beporokukivi.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/wotomiri.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/soresovirubowijonuwu.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/wozole.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32068911627.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/88651674132.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399559a7890---16847748489.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/lolobivoguvelazarizo.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/94603620047.pdfIn PDF document text
    • http://metabolit.ru/files/file/fubasudodivup.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/terobuworomu.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/45929943004.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/penolosikifes.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/32612710720.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/12509836567.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/vanojipapufikuv.pdfIn PDF document text
    • http://orenprom.com/img/account/file/zovuxuvudobifuxozuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fr+drift+mod+apkPDF 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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10276 bytes
SHA-256: ba5604a9bb79727175df43dd2f76903c2d235d49064d7e85da2aba5af25b87c7
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 17488 bytes
SHA-256: 1514fc785c5fdd1814fd28e09a8a5b704f7dfa9bd57b6da79fe7a5e9c6f2af18

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