Malicious PDF — malware analysis report

Static analysis result for SHA-256 c028e2db0edbf820…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 11:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e64f9cce887e92a8c2819ceaccf89458 SHA-1: e1037753b3203625a3a105b287a9b5dcb7beb3fb SHA-256: c028e2db0edbf82026185015b440e17f726832c27712b36c37d5e662c2659645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=copy+invisible+character PDF link annotation
    • http://roberlo.cz/www/files/file/78166376097.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/94069809891.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/42429391340.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xosawudavelozoxenadosax.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/55956662978.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/22040615985.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/suxuxufededefusuvoloxopif.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05b29cd38---26851101140.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ba69d538---83343496174.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0de7ff7b---85274234939.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/jabodamafabelu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/38324923723.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/denojuw.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/78716336631.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/78748790802.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/tujurij.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/pepuv.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/10933215010.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nenafaba.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mlbcg5hr8viostk367vc78mtu1/72538352604.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/73995477270.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_off0000ae5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5F 10824 bytes
SHA-256: 152ffe878157e2a23a4056eebfcf75d96fbf2dce7a7e5db96990df8cf59e6fc3
font_01_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 15444 bytes
SHA-256: cea9cca6777103d5f8aa53f661a1353c51c6d4af98f57b6080ebed229b467350
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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