Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7864a28b7611df4…

MALICIOUS

PDF

80.4 KB Created: 2021-07-03 11:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bf6498d59e4a26bcdb24fd6501a0016a SHA-1: 844d66b81036cb5c39f9be4178ca3cd1d7460f7f SHA-256: d7864a28b7611df4bdcef1db5fb142d97381d04359066016d42e2eab83329420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary attack pattern is to direct users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=practically+speaking+2nd+edition+free PDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/559d46bb9fca3dcdd1e8c9002eaa4f3c/93406882174.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/32912oupi94u6qfi7vdheqes67/37496472702.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fanaxaponageve.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b611ca1de23---serotiraxewobixi.pdfIn PDF document text
    • http://mesterek.net/tmp/604067593.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/bd5ceb06f5fcdb30d20fd49e9c505875/27189244684.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/358fa5463a6c77b94ae8577c287830ad/63606605273.pdfIn PDF document text
    • https://panama4d.com/contents//files/13342013618.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/dutugotuxasavavi.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea79ac399---mufugokodojawezapowavud.pdfIn PDF document text
    • http://dgjst.com/upfile/file/22874868965.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78c5026c4ad4cc39ef41645f907ab1b5/bukewu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a94f4ac2703dd77eb1c573914a471acf/gaterekikegumebivinenalum.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c6b1684e---ruret.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ea48ff95---66209721900.pdfIn PDF document text
    • https://gangnampools.com/contents//files/28813918371.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/buzusasokup.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/46956317760.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mq1jblkggm815si5c5ki81m9d4/paxolofudibiwegamox.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a565c5d4496e00e1218b2f96c74f2968/48900139739.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/92821869664.pdfIn PDF document text
    • https://melz-feu.ru/upload/pazimox.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839cf8c94b---dubowezenuwonijef.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/33923716329.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fosiwen.pdfIn PDF document text
    • 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16760 bytes
SHA-256: 0748b396205ff007f4fbc54153c9319683bf3fb42d043bc2c2359ab09145838c
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 11124 bytes
SHA-256: b06b6ae03a7dc4a9fd4d663e42bedec60138b7192ca2081f1e6c77bf420828bb

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