Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58ec4a6bbbc37e…

MALICIOUS

PDF

90.3 KB Created: 2021-10-05 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 158d2aa3b57f0cd100c9885441c5a757 SHA-1: 409b924b718bbb849e37c9b43e6bd859ca708e9e SHA-256: db58ec4a6bbbc37ec23579178ee86dc6c611606fb7865f6ff16f07ae357e1075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised websites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=red+headed+agama+for+sale PDF link annotation
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e9f19302---dudopevewigunir.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6966889865.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/19199811561.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wibifusirenuni.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/jubonozenugusiburex.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092606123399.pdfIn PDF document text
    • https://activepymes.com/pub/file/83650976288.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/63224006502.pdfIn PDF document text
    • http://www.agot.pl/upload/file/42766516184.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/86732804433.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/87551218982.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/kotefok.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/90867641748.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/19506797226.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/nuwerimoviriropupe.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c350d633cc2c92f55d243afc181e08b/21062478304.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152aca6e8781---xifiroj.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/satijabimotapogadaninota.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210905174955.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/16558444831.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210929055734.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/juvus.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/67718813138.pdfIn PDF document text
    • 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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10552 bytes
SHA-256: 9604988ab5dc661243d534d88ec1e1c7a0e5fa2a3528384d85a1b3f5137515f2
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 20700 bytes
SHA-256: 4f8adb2520c3c30035a647bd88ee7178bdedf11306e08e8da7bbe674952576bd