Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddd827e9d6b181b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 05:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cfbe0c199ce47c415954ae185ac55a0 SHA-1: 5f1b0577e7838b2cb81359a07f5f877343642265 SHA-256: 1ddd827e9d6b181b25618957a65c601cc41102e5fed872592b049cd960c814a4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0f05c492---niroguxuzadipag.pdf In PDF document text
    • http://rentbucharest.net/images/userfiles/jobugosonadiwizom.pdfIn PDF document text
    • http://synphabase.ch/upload/file/bamezeduferon.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/voxakuti.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba15ad57e---31848037835.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611545ff4e83e---40011585174.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/87670034688.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/79d981285cc188c55412ea2788f22da2/bipuxafijizivevavi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60f766aac---22804037072.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/30461936745.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/bogagefapakewanemi.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/55433620776.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/larosenezuvunemusik.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/72595747771.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/8209709917.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a3464b66---70707974159.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/92245932588.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a5dd3d134bca0ef162a5179d3036b4ae/68598955230.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/45ebffbfffdc3faa6917d35056c0f545/31215487581.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeb187085---puropugezaginad.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vozutiwisedul.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1147ff8632978fb747f730cf1b7e4697/73888915904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tigerheart%27s+shadow+pdf+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 15420 bytes
SHA-256: 35ac908ca6f45cabc55cd9bfa13777193037b9b0799b429332aa4ab658a0f2ec
font_02_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10860 bytes
SHA-256: 8a8c85c85c152a3bdbc08fb584e84d3e8651f988a0ef9f192bd715a33bce84fc

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