Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97aad9cf64cabcc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9867a8bdc61e13493df77057616c384 SHA-1: ae950f86cd84082b99cd496363f9935780cd240d SHA-256: a97aad9cf64cabccdf21beaa36f31554eede5a5f348b2d2023d027bbd24abadb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://jiab.net/userData/board/file/85056509879.pdf In PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/96215223528.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078682fd0da3---46440411073.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/45704093703.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zenajufagojedibugivu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zewonunopovadiwenewur.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/tafer.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/36209087454.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/35951852430.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/90263088822.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadddc9b18---85587706629.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gkoluhhahjapet4296d0fasbnj/95615560327.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086922e893ac---84405512433.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/49436882399.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b494f4dbcd0---bexun.pdfIn PDF document text
    • http://azizolace.cz/images/file/vivureteruzenige.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/94648461437.pdfIn PDF document text
    • http://cutskytools.com/d/files/zidamokudupuvi.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/lawesojepiliraxigisuz.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/tovizet.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/watiguzewe.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/laxadunudojumememepukimiv.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd155e1dd---jelaw.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/34458492322.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sinosut.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/17550147664.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/84307017723.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/nurubiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=materi+senam+lantai+lengkap+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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10804 bytes
SHA-256: 03d02d45ac171242c866275fbd8620bcce08fef14e6b463506051bd602ab9463
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 17212 bytes
SHA-256: d7f6381596ec0f2ab146b0b40e1ff3298fbd52d18246e931c4d2122e9855f31c
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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