Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17a3c5d8b471b31…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 17:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6d8ffa2b0fed13f7d0f369b395f04d3f SHA-1: 4f6a514a525e1ecf366726e56192590ac76008ce SHA-256: b17a3c5d8b471b31b5cf43ebcc2992c4d58febc1a62737a071995210ec30858f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=sketchy+path+reddit+pdf PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff984aa801---71361873763.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ad47114db---23053116946.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/79147400217.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/44196545403.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gokoworaletidizesa.pdfIn PDF document text
    • http://roocenter.ru/upload/file/letukimizefotamoline.pdfIn PDF document text
    • http://benrassam.com/uploads/files/puzunerubulakojuxegit.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/68826036432.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xazigimowazedesegogubegup.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/22986685659.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/12941503323.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/88914664193.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/voxomusawifesikaremaku.pdfIn PDF document text
    • https://badrivishal.com/media/92995774944.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/dabezapijokimiremiva.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/vinatudiligefamifej.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/meniluso.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f5bbc487e44bf170384f4fdee09aba5d/96959234993.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/dudititekikobejemakex.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f0142ceae8523b9afc5b340422a50fb8/piguwiboridudiseg.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/pipizoweda.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607310bc00946---56065459464.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3e631252---61996997642.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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 18624 bytes
SHA-256: 4bb20b2c140034111677d0e12adaf2d4987c38eae33e2932ee8957bd9ef64f0b
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 10560 bytes
SHA-256: 21a1b02832b35e44c7cd137e99b15381ef7e43151c8a5c57dffe60d1a7165a8c

Open this report in the interactive analyzer, or submit your own file for analysis.