Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de4f5be6bd85cdd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 05:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a03c89a240d8869407006c5a97b58a44 SHA-1: f5e938a94c124486a2282318703a55dd551d0405 SHA-256: 9de4f5be6bd85cddc34a81d5c97a85f1bb2fe221cf29326f4625c134edf4159b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a payload. No scripts were extracted, but the overall structure indicates an attempt to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://onecre.com/images/content/files/nomomefafeboxesasakijaru.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/tovonemuripozejabake.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/57216529194.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/89505540823.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/weledade.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6d0b356efddf0b19bed3cc5fe0112db0/sokez.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/14307274342.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3dc4a4645f0ccab79d021bd7771cb00a/81542830148.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vosiz.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/83977563623.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/laxub.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/wodufurasogipaguxokuf.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161311e34052ed---jotivalujegijakesopopupo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/ledivotopabem.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fofidexemisazowagalozeje.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tavusipanunibanoberig.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/nojulusoseropuxig.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b18ceb864---16341397954.pdfIn PDF document text
    • http://jsdarvin.com/files/xupaguzaduze.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/sinagudejezituwipij.pdfIn PDF document text
    • https://wineart.online/userfiles/file/jagaguwifuzoteputeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chrome+os+android+emulatorPDF 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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 10644 bytes
SHA-256: f51ba16f005e7aa7826706ddde7619300fbedec08eb95e739bc8c7238195f577
font_01_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 17720 bytes
SHA-256: 61985c431cbb91b79b4a1c0146d8e005d075df762599802d0d7c0da3ff548b8e
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1