Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d3c41c5dbe2ec6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 07:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccf7e22471b66d060cd90cafa8a66a23 SHA-1: 5e6ec9665f6c3a4045f746a8978bf7366ecb3bff SHA-256: 10d3c41c5dbe2ec6d6c29a86ca7c089b4f03cce70a2e4e4b385f3cacaf220437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--fiqa735be48e.com/upload/files/doretuvugofosugifasap.pdf In PDF document text
    • http://idealthailand.com/file_media/file_image/file/12776976077.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/gusedijilemetuv.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/58214231705.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/38c1bb5e2b4b0b99232ca822a04e1579/kazijikedelexek.pdfIn PDF document text
    • http://rhondachem.com/d/files/livijaxefedajowefimot.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906130333742364.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/48469128406.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wodotase.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/59276231498.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/97756728321.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/46481199248.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/wevikuwa.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630537936.pdfIn PDF document text
    • http://dsfly.com/uploads/files/24599740486.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zirigiraperowa.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/2967099567.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/23972099628.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306bde467e9---dofasaderatafi.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/miwomavit.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4ngj76ks5641aclbfkgfma1ii2/78080225162.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e0a4714d---594396516.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/29581625834.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/lulele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=advanced+abstract+algebra+book+pdf+downloadPDF 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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 11068 bytes
SHA-256: 8faca1cbec6a9402e483c606d5fd87b90726c1a26caa04ffe795ba7357d1c030
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 17372 bytes
SHA-256: 665f293831b28d5bc81f4972d1b96db856f1bdaf1b112fce20b5094a6eedbc28
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.