Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408847fc15529db…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 04:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 675394d98492ac7d0141961857d7bb09 SHA-1: 79a9301d7d02b02f79970ee4c99586b89ef1129a SHA-256: 8408847fc15529db77e16f3b0f0fdee742bce352304586bda1ae912c4defda0a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://i-p-p-c.com/ckfinder/userfiles/files/novulukazonukotus.pdf In PDF document text
    • http://rghsalumni.com/clients/82979/File/ronemulomagegigez.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/83750703786.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/vodulapelal.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/kisuxerewuvi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea3ec1169---71366529991.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lubulutimojebax.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081abd494cb7---26227214675.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/54516888756.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/27606452.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/ronuli.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f71a40235ef---91221192964.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858caca24c0---lirenapap.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rgo5psd0mrqj8fp7qpukc45gkj/jikolexuboziwav.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e76921f2---femufavagupuzogini.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/bujofapujoniwi.pdfIn PDF document text
    • https://rotherelectric.com/files/vikewazipufof.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kugiwutoweri.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210726074909.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/85787672556.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fiminirozomoja.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/metebetasuferorijanepowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=phonics+practice+book+kindergarten+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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 18140 bytes
SHA-256: 935b3adf063c8b197d02e104440da220d27f104d4796ada895860551e9f534aa
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 11084 bytes
SHA-256: a4acda1a1622c8c1e6a25b82c06d4a27497145b552a5913e713f42e5bbc0a6aa
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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