Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd41f6db6650f71…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 01:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fab317eec314b849db53242e6dde443f SHA-1: a020b81b4bbaec7e4379991b277c88e214493e80 SHA-256: 1dd41f6db6650f71ce6ce71b114137b1f6ccd0aa59a0b0e80fb3ba09d9893415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pmfegypt.com/userfiles/files/64162105600.pdf In PDF document text
    • https://millvalley.com/wysiwygfiles/file/42497800830.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/vikizoz.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/42800271769.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/53228481517.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/laxovivap.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210906_165656.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/sonineba.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/42895774491.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/naruwomululusawanevisukuv.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/74678826624.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/2578763569.pdfIn PDF document text
    • https://0900107678.com/upload/file/xumalazasosaselefo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/79890805503.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/dafositigudukasuvixu.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zigos.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/98876682638.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-15/20210915170540649653.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/nikojusalif.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foborupew.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9eb307c5e8dd79f4fb72658388a5647e/sokaxegisojedenevizim.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/sibiwebejakibofu.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/74951508571.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/zelalezatomanan.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210906103011.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/18345759740.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4296c9341c54bf93bd250b4a0c5ff20f/96625262874.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a922f41788---pipunutofanixil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=captain+america+the+winter+soldier+game+download+for+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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11184 bytes
SHA-256: 8ec984a88922b651438f55ff3a6df3437ddc841d3851060132ce99de3369052d
font_02_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 18524 bytes
SHA-256: 658372c2e161ad841560fd794cb6bb56fe45d7dd3335b1b1a1fa6cee557bdc6a

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