Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65cd75364af5917…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 02:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2e1924483a7e7f2d5304d295bfcc413 SHA-1: 5ca6811b65cc9cf3d6cc3fb9057cf7ed8c3f8ca1 SHA-256: e65cd75364af5917a2921b74255199fa9abd73e98e4f75225ea971eaf8a17a1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or potentially malicious websites. The presence of numerous embedded URLs, many hosted on disposable or compromised domains, strongly suggests an intent to deceive users into visiting malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hotelpancharatna.com/assets/userfiles/files/80045873699.pdf In PDF document text
    • http://eia-edu.com/userfiles/file/17394701289.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zazejun.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/84128579994.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e309d152cf5---27823751085.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872d5e58710---97444165334.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rojid.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nufegitoramumu.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/rebovazosetenowup.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/75280169137.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/mitafupupotofobifa.pdfIn PDF document text
    • http://brukbet.com/user_images/file/lasafevojanurewixatoteju.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/50757be8446d09163f9619c9586c54d2/80084197136.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce0a30c10---romonebezerosuvejivuva.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/fenunapiwugaximupide.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/voninunubunuroka.pdfIn PDF document text
    • http://sun-tes.ru/files/file/lolomojabib.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc82ea98bd---16107816458.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e57a446701adb7d6dc853d6e276a0941/xufuvaxudapizupiteduno.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe345d6fd22---tigoja.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5aff9ac77---pefenazi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a0fba32047cff7e6af12f5a842effb18/5005841405.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160858ed136841---83879788718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=merubah+word+ke+pdf+dengan+androidPDF 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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 17804 bytes
SHA-256: 105e85d283db36779c4564ffa1201a5b0216f124b738d29883ca8e43477900de
font_01_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10876 bytes
SHA-256: 39a15c84111af1c6b119b4a39607c27767bd2e7779b070d01f240107f5c061cf
font_02_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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