Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c5ef80f97bf90e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 06:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 169ba7f52991924e815ffa88a989577f SHA-1: 6adb369842176c711d44a0a02d7b2b6caa1e0358 SHA-256: 07c5ef80f97bf90e31e2d7fc351188050e7802e7e2ef18c743229ab33f1e8ee3
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21adaa364---pemixuditesizutenof.pdf In PDF document text
    • https://priscar.com/documents/files/sefemijikovakonu.pdfIn PDF document text
    • http://otczenacts.com/media/files/jojefijukarevopawi.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/30240554084.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/junorivuvisinew.pdfIn PDF document text
    • http://cnc-ar.ro/files/file/jogoxinudonopokozesapiwab.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/mafarigowutejukonuwapof.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/78985096845.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a1756bcd---20802816640.pdfIn PDF document text
    • https://hobbypet.cz/files/file/78795615239.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/2202946557.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/gujowubezavupakobev.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/69915108089.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/72289110394.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/roreliverojudezex.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/susilix.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/402553f2fb69da1384c3173f1c912c7e/64806330469.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff175c789f---javizapatalisidisikifawi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/dapusadoleg.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/daruwirabagisabobupepilet.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/11625854169.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/18234713787.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dagugonupod.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/nolope.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/28358360494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=transfer+android+to+iphone+using+computerPDF 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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 11084 bytes
SHA-256: d46c2dc5eb9e0b56d6091f6e7a62282ccd3c4299fef28d189cfdac6221900dc2
font_02_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 17440 bytes
SHA-256: 970171538bb137d249d5f837fa97c1e7676540f0adaaaad0370c06e44cfe007d

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