Malicious PDF — malware analysis report

Static analysis result for SHA-256 da53822eceb5493b…

MALICIOUS

PDF

84.2 KB Created: 2021-08-25 05:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 620c8c0c42517d92961081d75f981123 SHA-1: e552413267f257e0ada969e4ee448a26aa76b7a9 SHA-256: da53822eceb5493b4c6c4e3ee7f42af743b6486ee5c6c63c4363894323d6f349
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160847492bea96---xobogalitadopijil.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/69180419041.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabfcb7485---98702154659.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/gimapusuraxixarerodo.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/92991395975.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lp38lad6gem9a2toqk4clar833/dumexisojibazukuninopix.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ac235ad5a66---negutipopuv.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/046e6359423c6933eab5622637d0a39e/17905697054.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099714012b26---maguzanowinurubarijumij.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/7306d639ba9d4cb12e8d8a977006e992/71231670780.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/ziduxarurisetoxaxedebeweg.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/fazuwugivufafilibuxefon.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zizon.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/jefewufekosota.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/457277388.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/17193146140.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/libumusatosu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160762e7ebaf83---64958616451.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/81597764473.pdfIn PDF document text
    • http://medi-sen.com/files/files/nuvetozubumebawidar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=five+basic+relationships+in+confucianismPDF 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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17156 bytes
SHA-256: 7e4e9581a037c32677812e3883b64dce7394321317c4df807546de197cbab39b
font_02_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 11028 bytes
SHA-256: 5341232aafe4fad9bd0d4f2eba97af576d8c0496d59606d7d27fb577c070e0ea