Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb0d52625b2fe4…

MALICIOUS

PDF

89.9 KB Created: 2021-07-18 20:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 60edc333955a6521bfcfe2473a7102aa SHA-1: 5f17ba99daf4d2a8a58f4c1584116d0dab00b9a7 SHA-256: a7bb0d52625b2fe48a12853c8190f0820533eec32039a48a7ef17c7c3d90b76a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection or further malicious activity, and the ClamAV detection confirms its malicious nature. The primary attack pattern appears to be a link farm, potentially used for SEO manipulation or to distribute further malware, with the embedded JavaScript serving as an execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://horgaszvelem.hu/ckfinder/userfiles/files/34472990476.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f54febcad2fba5a4ab6d081116a39213/17202124532.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/pisegomoxovar.pdfIn PDF document text
    • https://irrisyst.eu/files/file/revekumaxebujefapesunuzez.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/94600354458.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/juzeputiretatovariluvukab.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1412173cc50c315e340efcb350a7ed34/35732124876.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pifowonarenigamegexok.pdfIn PDF document text
    • https://irrisyst.eu/files/file/juvetuwujodotumifajedun.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/muloxosiwatifofemapiped.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befda748ad---26707519341.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/vagez.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06cf615e3---gudotibegop.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6fd21a6ea75e605ce2566dafea93c0b/wifalopep.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a991986a---84746934204.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fckog655tno5mvg7sm8ik1lour/17519656924.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/14946182060.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fepugavexurokikejefo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/97c495c660e6afa48cc261d72b5ae23d/gukufepopafulo.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/44712146351.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce932be9621---66585890714.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/84818473565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=harvest+pointe+cutchogue+nyPDF 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_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 17936 bytes
SHA-256: a61cad35acb4f6d75417f345bd6bad42b59f1c57fa34f11cfbfdc6ebe562be25
font_01_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10880 bytes
SHA-256: 87dafe83a3078f2bf371a2220c295b83f540a0aba1202384b0cc926d2ac9f668
font_02_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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