Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0637301e13e2622…

MALICIOUS

PDF

69.4 KB Created: 2021-05-27 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2146cfa23b8f5cbb9920cee51044c2d6 SHA-1: fd3deb0289710089fdd4b4e4d9430bc2b8ccde0f SHA-256: f0637301e13e2622c0312d7a6d93c09223e4601fd33b324ff50f73cb82af2f7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to host and distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mariellatriolo.it/public/file/75499888976.pdf
    • http://birnagarcollege.in/userfiles/file/65845268889.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5fcc30437---sebaru.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a45e2ee64d457849953c62801a637482/69135730084.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d463e7d603---50228481666.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1e572afa9ee7916f1a072ab5dbad8acc/72556910507.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/31fdbb8b5907a6afb155c0b43ac74ed0/23614938090.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/34122d599a0cd77c37593870610c4f39/mefefuvebuzigedufawe.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/ronegozax.pdf
    • http://n2nlah.org/UserFiles/file/jijifap.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084188e8d2fb---50222935841.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9788a3b8---juxufexuzin.pdf
    • http://esoftland.com/userfiles/file/watupakosebo.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e45bb9c4---43158282777.pdf
    • https://cplastik.cz/data/cms/file/52545006696.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa040af2d5e2bcfe556e7f63bb56761c/jojaliwetubekijunagatukav.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607add137e30c---80718551149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=numerical+methods+for+engineers+7th+edition+solution+manual+pdf
    • 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_off0000d036.bin
cd6e5ff6573ae7eba880f15c69c8e8c64a38eceef68beca61631ed65328256d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 5620 bytes
font_01_sfnt_off0000e331.bin
84d619a30a9fce0a0abd5a4531067dc5dc14f33446bb8d3e6f52937e6e5c6c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10608 bytes

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