Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7151cf126a60ebf…

MALICIOUS

PDF

69.3 KB Created: 2021-06-25 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3045a45bef545d356ed3748e3b876a0 SHA-1: 96cc6122d6f22fe295ad8abfca8124d70a91859c SHA-256: d7151cf126a60ebf7878c28055a329b6f32273fbd09aaa41176114f302b0657b
194 Risk Score

Malware Insights

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

The PDF contains multiple invisible links, identified by the PDF_CAPTCHA_LINK_LURE heuristic, which redirect to external websites. One of these links, 'https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=solve+media+captcha+answers', is presented as a CAPTCHA solving lure. Other links point to compromised CMS upload storage, suggesting a link farm designed to distribute malicious content. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.
  • 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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ca5a3b7c---gonosowatukenupezutex.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/94nc3lrfju059ctpqnr17ehuu8/54580324864.pdf
    • http://firanywiktoria.pl/uploads/editor/file/vosazixazijafalibidizefiz.pdf
    • http://kleiberit.ru/files/file/50805533204.pdf
    • http://qlinairnv.be/userfiles/file/19210996492.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2acff074c6499f1c91ac3d06f8dcc966/6704261260.pdf
    • http://esistore.be/userfiles/file/wigiletokasepotosapulubir.pdf
    • http://1utilaje.ro/mm/file/bubijuviwujijikobulix.pdf
    • https://isleo.com/i_photos/file/vogoz.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/la5o1v5m97j69993phmer8sao2/4379857990.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dce750db---japewuluva.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4932dbff---87622220967.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5a2c9db4---biwujivituvogu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bf4d19af---71789443698.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=solve+media+captcha+answers
    • 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_off0000ca7b.bin
6ade360140f3f93465b60aa751c617dcccfb3d3029009b77ea9d92fbbf4101f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 5568 bytes
font_01_sfnt_off0000dd53.bin
c7217757a63842390ee8a58262df6685bc33629877c9322106c7038f949dc004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 12304 bytes

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