Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e6f592f15eab2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 11:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc66b0bb6d1996f95a614271382e146f SHA-1: 9e117bc370a90de9d65913844d5706680a3a865c SHA-256: ec8e6f592f15eab2e231c57c32b13c1ea0f7155afd8adfb34185f9678be6fb23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://giant-nano.com/app/webroot/userfiles/files/90652910486.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613325007bdfd---80217895263.pdfIn PDF document text
    • http://web5gstore.com/Files/files/30428943876.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/41334315996.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/lonixel.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/58935288685.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140061d20b5b---85875574670.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/8239132883.pdfIn PDF document text
    • http://domexpo.ru/up/file/48874079752.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/bezurojemezarovepopen.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/81208254484.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137164b052f7---67936146637.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc9edbeff---84834479769.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca47a4703---malerasoberipo.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/mezimubajozop.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/66100002557.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/48704549080.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50230601809.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/88896808232.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kutowise.pdfIn PDF document text
    • http://lgassociates.in/uploads/71253800824.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/niliwarulutevuz.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/56294900784.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/mozawalakefidexasozudofe.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/57867904094.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65441249643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scert+class+2+english+book+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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 11324 bytes
SHA-256: dc2bf6125666ed05898035cee640bd21eb1fb744c94bb123c472f346adabd416
font_01_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 16168 bytes
SHA-256: 5e64990db938ab950a325961dc852e15c53a073fd8b53d95a77c831d6b42fc6e
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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