Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7ab0223fe31f08…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 04:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f78469ac5ff2a415a877a5657151001a SHA-1: 21f529d1827c9851e8c99cb6182fb65e34fc0ba7 SHA-256: bb7ab0223fe31f0820e9b3279f2ab95808dd85f5996a33a6512ae638aaa696fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inprovitecuador.com/ckfinder/userfiles/files/10577341116.pdf In PDF document text
    • http://ace-pharm.com/upload/files/49382918566.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d30a6045---73396318741.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435d64ef32b---46358781311.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/42861653747.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/33512109217.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/92250161542.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/zelomofire.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367bd8682cb---sigavuxafegu.pdfIn PDF document text
    • https://europartner2.pl/uploads/bejelivetufawefufebi.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zafolitamizino.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a32606014---ruwopaf.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/46696393308.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beloguwozoxepu.pdfIn PDF document text
    • http://mobitransjogja.com/files/32792888795.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ruwerutifamamabimulelu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/54690161948.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/mefejuwixelej.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/67410064726.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/lumuzukufe.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5f894ed---sanikepupov.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/ruridirotopudasa.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/birufilapese.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/likofowovurekibana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+u+find+the+vertex+of+a+parabolaPDF 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_off0000c025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 10912 bytes
SHA-256: f7afbea3f883f4ca298d6ae67b38153445dd32a8a6c82ee079f24a38b87e7aac
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16688 bytes
SHA-256: 06760674f565b217699a5fe24002264d7dcccdf2ef5d993e4f38639774b30f47

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