Malicious PDF — malware analysis report

Static analysis result for SHA-256 893ac23ff9c9b0b9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 09:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dddfe6968cc8c8767f2879d936b688b2 SHA-1: c7da62c56ad8ba2e599c29f248cfad5a55807924 SHA-256: 893ac23ff9c9b0b94b105b751443123961850234d5975027e9329eb715c684b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide clear textual lures.

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 http://www.euro-fly.eu/userfiles/files/texisew.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141480b7a05e---xufaduxifurejewezosolafax.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/94496382150.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/kipivamow.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xojixobexuwurezufev.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/12407459070.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/janigusul.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/26013342024.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/16572890601.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/gewelo.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/56737467800.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/97261174311.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gagewupes.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5cd99bd0---35457875910.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/55769201570.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/74982775921.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/72844301159.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/jixipabifefup.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/7123267728.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/77979005418.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/68796337582.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147333c83fbb---56592866673.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/lupewatasarikivukolova.pdfIn PDF document text
    • http://proxima-design.cz/files/file/buzotitejut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pop+ringtones+for+androidPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 10628 bytes
SHA-256: a284f34eacdc5f8ffc113e38f7ab0f5033ce78f437dc3679c74673a1ff238a36
font_01_sfnt_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 16280 bytes
SHA-256: 138bd600549f51816d741ea73096f9e7f286fe69290e50b3e565a2573373df11
font_02_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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