Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26bceb3dca1c6c1…

MALICIOUS

PDF

138.5 KB Created: 2021-09-08 18:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21ec1637c8f727955dd58e9b42397929 SHA-1: a3feecfcc73e019be6d837dbecafb2b3c440bcba SHA-256: e26bceb3dca1c6c1e33435db1cba1261be85f8ef5f1e2e122de4c4a52b00c655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://newkontakt.ru/userfiles/images/file/92268887972.pdf In PDF document text
    • https://deesudcoolingtower.com/userfiles/file/deposapobigelobub.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133346e57996---88819648843.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901071323182507.pdfIn PDF document text
    • https://ijp2.com/contents/files/18619589066.pdfIn PDF document text
    • http://kechengchem.com/upload/files/votopeg.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41026720882.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/nutuzepafuvetixuvadununiw.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xilemumuxuribulumudije.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/doburupepi.pdfIn PDF document text
    • http://faradbox.pl/files/file/56658971118.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377f288df57---50867007191.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fukazubiruxaxogem.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0e3ddd1463f0de64f7333f5184e38898/lidevulokubomer.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86162327309.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63342792730.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuxisuwuse.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jemiwilijetirun.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hef9mgdf59shhidih5u1lnci7q/65494756772.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/67205307097.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kugobawodekejiroxufolud.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/67068242991.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f57f8b1f09f0bd1ea0f02a0823803738/90874100136.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/25382485110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=flexible+pavement+vs+rigid+pavement+pdfPDF 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_off0001b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBCB 11004 bytes
SHA-256: 7d5e4c2e08da3eb0e6ceded11ec3c6dfcb05901707d9cc65281cdbacfd4fad80
font_02_sfnt_off0001e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4F0 20508 bytes
SHA-256: 80b6155c7a3bad9a6916dcb346ff4b8ebb8dc88a7c20fe9d35ed72b8ee02462c

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