Malicious PDF — malware analysis report

Static analysis result for SHA-256 9753437ff2e32c2a…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 14:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c43fa6223eb1bc6690e4a228579f9721 SHA-1: 2df5a3e85efab8534c82615ef713e8f7986a9c5a SHA-256: 9753437ff2e32c2a3cb539a51c659b00f39806e5e53bad9e9fb9e023df1c5020
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://garglob.ru/uplcv?utm_term=distributive+property+to+multiply PDF link annotation
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/n55fics8bqnc20udg15qqvn0ec/murobudajosumoz.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/34457bc5dba41ecedb6a202c4ae71b06/23943799629.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/72175369962.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/34195671544.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/df86f1c01937ea9f9fc18ea17cdd6d5f/rusonuvup.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/25008162744.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9f4j22uvv35231sdjr0bgvb5so/jesabamamez.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0aa888ad2---56797743185.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79972adbd1fefbb7c4d40bc20e803f79/fotazofoje.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/xasunefaxog.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb764beddb---23505031926.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/40426586200.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/140853465e24a9ddf3045af2c5f0a691/35360997999.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cd8963e73808780b6c12b74abcd5b64e/57737329707.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8ed50032---levuloloderitemuloz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5de4aab609---3657749061.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/080bc4df8ce3fa22c4f5daac97ea9512/tarevenoganod.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609289d5db549---88719869255.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9cfebad5---kirunisujowux.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607353946de86---sibejabugexopozidilolimo.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/korodalilakinede.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1q31ob3uiion4cgdoq95tdcho2/73094408680.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/88a439bff9b54cd041a1cff512b46615/rokamivunezokomunamafefus.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7775931c13a631c605269e57afa4d469/28845440622.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db4e0f72eca33d38db9172a6fda71944/kepolom.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10568 bytes
SHA-256: 2d08a63ea95d8b83b627ea2b07225e35a5c29924a940265f0f1c0957c507e633
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 18472 bytes
SHA-256: 1a21800711f49d4c67d93753baa8f8c6c02caede9e1388ca7c99977f5b7444e5
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 16652 bytes
SHA-256: 5be2378ee9fe57a5dd842e30442b5d3e40d380a746c419b60e3f5f8b52658b83

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