Malicious PDF — malware analysis report

Static analysis result for SHA-256 7305561c23cfb23a…

MALICIOUS

PDF

98.5 KB Created: 2021-07-23 01:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a68a1726ea23f1d6b5a91e5ec18e676c SHA-1: 412cafa8c3d1a6469596694fa56c3fae1ca24c59 SHA-256: 7305561c23cfb23a99a867237d233f088eb2220e839ebe7ce4138b0519a5e5b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://triptoboloyfoundation.org/editorsfiles/files/supejoka.pdf In PDF document text
    • http://parkhighclassof60.com/clients/871169/File/beliv.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/89402210406.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5e3ae5df---28586745137.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/xowabemuguzixosexuf.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/xovabofalenupamabujos.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/68764133520.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8f2f142b---roren.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8448e2ca6a---63691665432.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/pivebijulegolebedulemir.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/31602948966.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/23900072807.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210713_7FC1AF74652A0B74.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/duniguketekisirubederidut.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/55f8b08f5f05bb68bfc2877f210f660b/56710068443.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e9e0f422---73199559887.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/15e809b98744eb0aa749e5a1268108f3/12686701773.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/navato.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/97132328148.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/26020457665.pdfIn PDF document text
    • http://12shio5.com/contents//files/99197899272.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/45703297047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=example+of+attention+grabber+for+speechPDF 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_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 11152 bytes
SHA-256: 8606cf6cece185c8785b7e0047f1d74aebf99d12581e9e0d30c09fa37066ccac
font_01_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 17068 bytes
SHA-256: 6a4d9b1c7c70be04e79ca7373828cec99f71f6631aa0225c6cafed9a4ad8127a
font_02_sfnt_off00016368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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