Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03efe7cc52777d9…

MALICIOUS

PDF

67.7 KB Created: 2021-10-01 11:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d97480ce5f593fb4ed68b15f23e59ef SHA-1: e4e31320d16ae995c8f5148a4e012cc2d1789210 SHA-256: e03efe7cc52777d97bed64cd8c41893ef0ddefab80c7de8a420fb57f7c69228a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=autocad+android+download
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cc30a77b---37244724395.pdf
    • http://kunmobile.vn/files/uploaded/20210907/file/12264859424.pdf
    • http://silver.jo/ckfinder/blanc/files/munerugazanipifima.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f160276497---bodinapasomijujulekonobe.pdf
    • http://kibbkw.com/uploads/file/94213894984.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/80241627477.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/kugesavopitifepudopejaxi.pdf
    • http://titadoorbinhduong.com/upload/files/67721607279.pdf
    • http://helix.chuing.net/mai/ckfile/files/5445762807.pdf
    • https://fabriziochessa.it/userfiles/file/60563898532.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/jamebovewusew.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c528763e---zogobodobuzeziwotewab.pdf
    • http://volkshilfe-vlbg.at/images/content/files/24177843630.pdf
    • https://masini-de-ambalat.ro/images/userfiles/61299490897.pdf
    • http://webursitet.org/Files/file/misidevore.pdf
    • http://ipea.kr/userData/board/file/xufosupakiwazitilebomisu.pdf
    • https://olamare.com/img/uploaded/file/wokazalekotuvekokimogel.pdf
    • https://thietbigas.net/media/files/82241871367.pdf
    • http://falconltd.pl/cache/file/lotador.pdf
    • http://controldellaves.com/app/webroot/arxius/file/99815111596.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab69cceb65b9101f30e31a7a74a60b45/topemidoxef.pdf
    • http://primaria-ciocirlia.ro/media/file/62833220091.pdf
    • http://dobrejaja.com/Upload/file/zuxozajofaxanovosebe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae26.bin
123dff42418cab828f60d2ec8e61d7a5db2e3a18c560c1c3ac7ec806208e1a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE26 14544 bytes
font_01_sfnt_off0000d23a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16792 bytes
font_02_sfnt_off0000ea51.bin
f0caa1bab9ffdaf06977890ecbf53702cf5ea8b0b37714b9ecc9f0922725c50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10232 bytes

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