Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3219bd94868b82…

MALICIOUS

PDF

77.3 KB Created: 2021-08-23 12:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8467bfcfa96033a17486fbf79c43bbc SHA-1: be3bb93c7059dace8009fbe3be08cc37fedbde75 SHA-256: 8b3219bd94868b82da4ddd8b9d98eb7bf374da34c8c11799d65f78805100c179
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document acts as a link farm, directing users to multiple compromised WordPress uploads and disposable hosting sites. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=2020+year+of+the+chinese+zodiac PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f62a8356d---sisugesu.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/80795826754.pdfIn PDF document text
    • http://snsi.jp/image/news_file/41891253570.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/93911295078.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/80111002301.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/76966441944.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/457ccfb99fc80130045d307a690c905d/45582028810.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/vikefumepigelalepijiwukoz.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kegakuwatedevevozafepafu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/muxeligizanekelotijifefim.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7548630bce---8998796747.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/12cf7bdaf990e106b774a6a9f2accadb/pomipuwikanebegamugo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dom73fpqbekhsbkonjm8pgv29l/23703239646.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/34932884972.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fd5c044f---fuzakavan.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sitopuvebevira.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i5e0og5r5tj5i2a7gsogedes6i/81168929278.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jbklc1h9cpr6mf7t1amletb9a1/94264642869.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/28a3af36df7a23a60e1b383015b6b94f/kilopitibuzemil.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/31094860238.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fn75h24qf91g899dcaedihi051/migefogepitiburixad.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002732c6f7---nepor.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cd87a188---77245581505.pdfIn PDF document text
    • http://mesterek.net/tmp/dasuse.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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 17548 bytes
SHA-256: 5fb4446b8505ed78decc1e5fffc5ecb7d367f650be32f1d3d342677d78c02784
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10848 bytes
SHA-256: a3a55a439f08ebcd4cd7f6ef684e9c4a9c00acad4dd83b39f8dd44eaf599df57

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