Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dc4d13387ca25a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 18:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d46c083297f679173aab9dd16dd7608e SHA-1: b023f6859742b044d62e50c4682fc019351a6a8e SHA-256: c2dc4d13387ca25aad819f1eb16881f4971aa19750b240bbb099608805a9e93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a high likelihood of malicious redirection or payload delivery.

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://angelescare.com/userfiles/file/garuletekusipet.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bhhoh0q1fslckk1hffieu8s931/3931632740.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/pofozalalala.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/59653576663.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762606ed9cd---zatatilepuzevinexilu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c2ac1b7a---sixerodowuv.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/31253831916.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/84c24013be8be803842e2ae445f6c0ca/79969307130.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pitivukosereli.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f261bc2---24081821423.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lifg08s72bqgb5dnsf12oo7te3/50829666978.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b435278b67323777da9ecff77db4437d/nizilezirig.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/59726174272.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/30888133195.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/45945835438.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h1ngp1k4dcgnt78d05fhgjr7ot/buseripasanesutavofa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afab08479d1---91977275539.pdfIn PDF document text
    • https://ewt.cz/res/file/fepafero.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ece4c747e---74730136166.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/wujewazegeg.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pi0o732qtaah4b5r5lgff9kcfc/73538184268.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e874bac97740f20e2d5fda8aaeb7b46e/91146883093.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/xavik.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/32507ba2ee67391168441b6240701c28/44768070182.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/65846064049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=outcome+meaning+in+tamilPDF 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_off0000bf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9D 19336 bytes
SHA-256: f9ed09fcec96bd39abea3947214a9a3a05137ccdd56b49ec9bde04518af8e67d
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 10432 bytes
SHA-256: 0010b20d2f6971091a72e6cd24d63b47e07cb067ab5ee725aaf57c803171b55a

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