Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d2e508e85c7b1f…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 17:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38d15bd98300fec668757f909c39892 SHA-1: 9e2779a4d2dffdea5802b40fa9a4e0e40d03c6a4 SHA-256: b8d2e508e85c7b1f8133d0d510a44dcb99bc474f0e39197eec53f2dde0d8c0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=what%27s+your+biggest+weakness+job+interview
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf777d9b9---1969449365.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d5fd746d---xobenejakew.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8a22fc7b---78070618654.pdf
    • http://nessium.net/userfiles/file/24759451498.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88874edc40---zakipimopom.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmubsq9g3mep51p9h0ghltrfqa/luviluzovif.pdf
    • https://aawyx.com/sites/default/imageuser/file/xasitogeta.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe695526f---95066725755.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/zakujepetasasufepenukuja.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ofg2fmor9mouu2a4tafb92b016/54928061853.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16093b23dd6622---93061805096.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a48ba1e0---10982525840.pdf
    • http://brmxn.com/userfiles/file/20210526104400_gcc01u.pdf
    • https://kham.vn/userfiles/file/27053192273.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d006fdb3---melifamerufipa.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f56965b594bffe41aa30075ee12eac69/52876499863.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/urs8ue0shna0ah6tkgv0gj91f7/bukofosawonusodi.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0aa45baa4---15170766642.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981d74d3aa9---67280978629.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7abincifkk2e8ve79jm3rkr7q8/26368374605.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/152orffpmds9bk0sol26rlecc6/dujuz.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6a4238eho9fmsugt5dve1s3v67/diwazasep.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9448344306dc2ff14964a5ac2a411a30/26354311676.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb98.bin
6cada4cac1f2d3e44ffb09a0f952891572e5c8590bd58b173f8edb8f85f86633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17108 bytes
font_01_sfnt_off00011825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 16792 bytes
font_02_sfnt_off0001303c.bin
9afa45d1efa6c09b70c602113eab82dac2dea4640fe7bf9c4df535a572ad80bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 11096 bytes

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