Malicious PDF — malware analysis report

Static analysis result for SHA-256 3284a18c33e78b4b…

MALICIOUS

PDF

69.3 KB Created: 2021-06-24 04:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e91e47eaaaf870a6576351a3b9cd698 SHA-1: 54b897974fa3fdeadafab589fd1e3b4e975ad80a SHA-256: 3284a18c33e78b4b1170dc41ab1dede718c19e8b35733bcafcdcad59f06c451b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure indicate a malicious intent to redirect the user to potentially harmful content.

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
  • 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 http://hzzxtl.com/UploadFile/file/20210617160529480.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75755415246.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c268b4c4716---8521620772.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc45e17298---dojisonuduzodugulezewam.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/89ceb1bd7774b3d225d90873cd049682/detizaro.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3a73e719---45636479578.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/23104550448.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b803c74b80---24520853970.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090572980cb4---14778515891.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca85356ed8---mujatobutalegaj.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073233c9de92---16398246946.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/295721baa02037f4a24a3d0614ad797e/rodoxaxixafi.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/27773a12d75dae1c5894ffcf2051d28c/75290021969.pdf
    • http://carszana.com/image/upload/File/15444956562.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84c0c16e4---gidabugijunuxukuge.pdf
    • http://nguyenthaotech.com/upload/files/42901876875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=honeywell+ipcam+pt+manual
    • 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_off0000cfb7.bin
3214971dbaef52890358a136427f28b32a33daf6e8923de4da47c7b09b0327d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 4960 bytes
font_01_sfnt_off0000e0a0.bin
f9951682ff68c158a74945e609e27b7534860e036ee8e9612829cb48b7ae4bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 11840 bytes

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