Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05a0f24fe8bb3d5…

MALICIOUS

PDF

88.1 KB Created: 2021-07-29 22:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50e03ec7490867cf1e657d2a58f0c262 SHA-1: db20a6d531288fdf20f67cb7c58eef2e96c694b1 SHA-256: e05a0f24fe8bb3d597ad86b83ad350e787f30423f12d37822eab7ad0f1a1bc1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4d5c20c12171ed7438728b8528b8ec57/nonotixusasuletoxuxenakep.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h3dc2m8fd7iclo6r26vbsdv7lk/xubuw.pdfIn PDF document text
    • http://teknis.it/userfiles/files/dasukemo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/47818980372.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/88752249216.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a714b8aec87---fifabudijezudoxijorigag.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/15228433512.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1f353ac4---8054861975.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a782cdc816f---20118560153.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vowetaxepujifor.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/33551059791.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160baf36fa5fc0---24238635794.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/98022628888.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f935b4be---51917506107.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/85449900806.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/duxufu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1c487242f60d0414eda9ad77a75f08a7/71551143239.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/zabiparufigej.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/64u5dofir0g9ubhng16coiv1bd/nonapekomikiredajuj.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5202e75c7f770b5f2ad6f09db8d4e49a/85528382333.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815b7f776b2---nizasoziwigewoki.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/90941134795.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b233d058429---pewupolemojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+long+does+it+take+to+train+for+a+100+mile+runPDF 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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 16384 bytes
SHA-256: fe05fee979b7a01edc7287acb5e70498afe7938610bed6f41c6ad6c511d3addf
font_02_sfnt_off000138a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 11140 bytes
SHA-256: 3ecd907ff68ed456b3d8a72be1387112d9353c2dbe0712b4657f1f08277df438