Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec2187f43df47da…

MALICIOUS

PDF

90.5 KB Created: 2021-06-14 18:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6a5a7ca4d38cd313e33d415049bdb8b4 SHA-1: 918474fe676c52f28561811d7c2ab25b4b5aef3f SHA-256: dec2187f43df47dab6c8ff4d3ceb3b602a446ec0de2d4345ed582ba1c999f9d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=mazindol+2+mg PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/30973a67085ad25ffcfdd75a7b5a7bbd/bulaluvajedafapuv.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589a0ace42---74564734017.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160903af1204a2---fafatip.pdfIn PDF document text
    • https://lecachet.fr/docs/files/41674134825.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/46200254932.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd7c917fceeba02a983dde4e9c28ab0d/32700457691.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5uedu39shnn77bo10n3v39j8vl/10143949603.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbed0a118---47877333014.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fotutudobiva.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160984f38822d8---dumomukagolufi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/24334411df62d0b98de0fa9edf8f10e1/mizevubawuxiwemunukalivow.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fidewaseralef.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/88023f9a6c26c0bc5e084d86be6a2606/xuxisunovumogilosenamiv.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cc51272572f24984de8ea6edfbdd350c/lifexofigubapole.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515201020_2024343802.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/75252864837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 8672 bytes
SHA-256: 7079b9296e09aba803f8c33b33bf7c18d620db3167b35182b05a6f909288b1e9
font_01_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 5056 bytes
SHA-256: 3302e3d1778b853b6e426a079ad0dcab0a9736e06ad831118e6d0780b0b0f49c
font_02_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 11948 bytes
SHA-256: f563fefab3310ca4c10427188b13c9ecf9e9153021a5ca9f8ac40f3aa11156f8