Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b904fd6eefebacf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 21:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0413fb2ebf93aded1e2654ebd9ec8fa0 SHA-1: 89e024076bd5e29c30de907c56cf2586dcd6eaf7 SHA-256: 0b904fd6eefebacfbefeef080d95bff0a465dc83f714f450a7e57bed9640f5f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=pokemon+hack+roms+2020 PDF link annotation
    • https://hotararicedo.ro/files/files/7177631597.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimerasirukinel.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/59387065612.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/31801588729.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143230be696a---61180987153.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/30834576064.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210915_220802.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/92791437469.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/31834493614.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/gimagizimeni.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/kudofovovomojuvusetamopo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/68754060937.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce661ff7383f521f317c0e67dc8bb130/basutotitoj.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/47438161996.pdfIn PDF document text
    • http://gerocuki.hu/user/file/23506396518.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/weriwakuretesinisixo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399992bb554---14985844539.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/87dca1ad3b4161258449dbf2f2190a04/20801967053.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/sapin.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gikulin.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/72476098081.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6fc3c65---80677243801.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 10592 bytes
SHA-256: b718b71a67df640b2407fec1a4e4e655d3cd806ede93e4cec4a176e1e1c7eb8a
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 18948 bytes
SHA-256: 3d1c1b049fba65d12e7c598b513eb730e85dba41833855847ad8946734c52a2c

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