Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc8eef4c287ce38…

MALICIOUS

PDF

73.3 KB Created: 2021-05-30 09:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0ad8a17318362e888c9bbd7f8f17f3 SHA-1: f0a0e7d08de5fedf80339d4c410c481b873eae6d SHA-256: 2bc8eef4c287ce38e79633eab1651e42e919f8a7b4be220cde7b80c26bb14b0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7789cee7fdf409731bb0c2cb9014191/mitemulag.pdf
    • http://short-story.ru/upload/file/firaniwunud.pdf
    • http://ngor2-3.com/file_media/file_image/file/65709811217.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rssgvitlt8bbia33ir282k24lc/naxibibujeburonozav.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bddd9528d6cefd1d1eb43c64ddf8a51c/5668477949.pdf
    • http://greenbrier101.com/userimages/fexowunezulerakoruluw.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kobowulixizijapeji.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04414798f6effca93867d2873a489c35/23018807853.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3psf5rllfpid78v2aieib4uj04/xujenaluperupexizixu.pdf
    • http://bygreenpure.com/userfiles/file/19121047316.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910ba35fd5---malarosisugurojexit.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076220d44f60---19816279002.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608214e7b9fcf---retagurosigaxelobunodafu.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fc63b6e5535f94187b12c4718283e9cb/kamirofuwixasas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+website+to+study+for+canadian+citizenship+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df40.bin
ef534d457d0ee26d704d59146b3d1ba0f75d47124930b1323443170569079e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 5644 bytes
font_01_sfnt_off0000f290.bin
a006b766aee05aafefbb39faf58e57f548124789028391365a9aeb720804e5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10872 bytes

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