Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acce0ea892935bb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 05:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5f1afb61e7007d09e2702e36bb07a08 SHA-1: a0cf40bc6afd5b5d06b9f4052d40ced13579d57b SHA-256: 5acce0ea892935bbf9c26b81de942a2bf05b78a1a74e0dae9826a4e122ba1616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=temporale+pr%C3%A4positionen+daf+pdf PDF link annotation
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c120a9086fba05ab2272920698e01b0d/18921834352.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/34459595868.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/80639283329.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b4127069d---63724448800.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43742327256.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3233f484f6cc03fc5a2cd43c77059e10/19578807184.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/37166949909.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d18275f7ed7d1326b64bcf42335cd60/16302165772.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38026900695.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/napifagamul.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/426fce929e5e6fd0456adfc35de734fb/munevitabiboripopepuwan.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/sudanigeruj.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/xusuxixobidizifedex.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924030d14e6---88003975956.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/ganipezolibebe.pdfIn PDF document text
    • https://laser123.com/geektic/files/pisobuxo.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/91707741541.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/60821254892.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f1f137098---vawakapopijo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/34686048790.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//juvala.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/gusedixajubisopolonid.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/74365234789.pdfIn PDF document text
    • 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_off0000bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC83 18580 bytes
SHA-256: 50cabcd74fccc27c361dcb05dbe87aa52d85704d49199e92073c7a429630d2ff
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10876 bytes
SHA-256: 64d05fa8492002ad08bc3eeb93f72e963dc47c51d1f338e153823b5f3e5566b3
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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