Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a25031644be33b…

MALICIOUS

PDF

100.5 KB Created: 2021-08-30 15:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aefacdd04e374d5de94ed36d31e74ead SHA-1: 1b056703b55bdde5c5e4a8e13be7999615e442c5 SHA-256: a7a25031644be33bd0e883b5d131153515821e8719c868ed6f13e54f40026d60
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports a phishing or social engineering lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://jungleflightchiangmai.com/Uploads/files/vavivaxoridalopab.pdf In PDF document text
    • http://medipharmacompany.com/userfiles/files/sovonewenefozitugige.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/75060169289.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sowitabizak.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/98836335355.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091931c19242---zadokog.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4b2d8a87---rolebamawefabevus.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92873212158.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6d4985ba---mewiwuwasawunuvuxinero.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/rigoledeke.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202108140524133888.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4iri6h2nv3d86bmkegn5ns0ea5/mupuxan.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/gunazabu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e924aa7d2c---24699128927.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hae9srq4o0vtkuk41o86c705g6/7545275899.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zeforoziperumipasogexela.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fisofebagizefiren.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nozulusodunipozepogarunok.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/sebep.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db8ddd52f---sujigariduxuposevumafe.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b6d00e934d7f6371a406ee0ea95e7b91/9402366934.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/51775751819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fog+hill+of+the+five+elements+sub+indoPDF 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_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 21400 bytes
SHA-256: b2f254bf582b9ed52ad8d58a020f0f591944c2262bf7a87576ba2564622aa92d
font_01_sfnt_off00015341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15341 10824 bytes
SHA-256: 534bfaf7f559fcacacc20280564047ddf1e7ee0ba79b8f903e61538c9473b790
font_02_sfnt_off00016bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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