Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbd762820eff8eb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 22:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 726117a42f6e3d0e885cfb68e66c1c30 SHA-1: b5c9c97fe5ef6080c1f6598c18bdabcfec35ac6c SHA-256: ebbd762820eff8eb142d146e1b1b420aa70edccb66551961bc56af6f2985fdfb
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. Some of these URLs are designed to appear as document uploads, potentially luring users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://advance-pack.com/editor_upload/file/fuzolefufabebenoregexek.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/e827d8ofvo9h65vp0iqej39jmo/ziviba.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/xoroxumop.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/1262353306.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde60a6214---rexukadigosudali.pdfIn PDF document text
    • http://www.heksan.com.pl/file/64752047413.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/74407590897.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160793d7761b1a---vunavidanujatuwagupuket.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210726_3D5E3554DF7FF8E3.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/51957874497.pdfIn PDF document text
    • https://dhesient.com/media/16364383344.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/feweximopejarilegizom.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff90b4c21---pelasuri.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u2arj8cep95s5phmgr11e5oll3/fefaduxekemataduko.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610f73f01e4b1---komenomapogitew.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/13452017714.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c066bd1ac26---88879254497.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/03ies0qfld8r1comgruchv1e7k/zasepabewoxironot.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/menutawelow.pdfIn PDF document text
    • http://ezibra.pl/upload//file/66130517229.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/17214820465.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2a608526---nonisemoxigikejonixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=properties+of+characteristic+function+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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10772 bytes
SHA-256: 57c81ed0fe09d801859870fde0bb5363db856707c68c3a66b8f48b9cabbdf495
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 17600 bytes
SHA-256: 693018b4b1f3e3df9ce39197b22a824c7313a790c306ae8c93394b01f303d65e
font_02_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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