Malicious PDF — malware analysis report

Static analysis result for SHA-256 687c2b49c0510508…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 13:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e7e398c2d36ebf7835332d5c4d0ebb SHA-1: 01d203ac27557c1985310529634694a90b32e371 SHA-256: 687c2b49c0510508375d7676d621835e0162603b3ae7bd95be189adf2f4fd591
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as a malicious phishing attempt, specifically an advance-fee scam. It contains numerous links to external PDF files hosted on various domains, likely serving as a link farm to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing lure designed to trick users into believing they are due a prize or parcel requiring payment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://conrays.ru/f/data/53992593255.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4d65d1419146aa38636355ca6c1ec741/lepak.pdf
    • https://usgcambodia.com/userfiles/file/rujujekubit.pdf
    • https://o-dance.com/upload/files/dopukeg.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/dijusekorowiwazuvu.pdf
    • http://daydeothe.vn/rich_editor/file/feralukofixawu.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dcc62971---rafepaxune.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/77f9e74a3a799fb132971f87cb7e74b5/vojanovulexipiwigilebaten.pdf
    • http://tcsm62.org/uploads/news/file/fulatosinoku.pdf
    • http://jcpingie.be/public/files/99037462253.pdf
    • http://mueblesdepladur.es/1/userfiles/file/25169454867.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/guxarenomikekoxido.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pasiwit.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/sopuvilifawojo.pdf
    • https://andana.us/files/files/fejosetexosagawobodid.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1e03968f84a96392795d01293c4f3861/44069767454.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/61707364318.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/risatowodexuxulupuwe.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/bolitobovogogun.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/fizawabu.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/74927751679.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed24874d41---83414268844.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+sync+ipad+calendar+to+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
font_01_sfnt_off0000ffc3.bin
6127a6faeec5ce88a8d900d8cee81661ab5b5dc7902a862d77ecab4f751052b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 17620 bytes
font_02_sfnt_off00012dea.bin
b428078933c65b17707c97c01aba70e19ce2923a3ded887bc1558e7691231a96
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 10804 bytes