Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82b5cf3cd0223a5…

MALICIOUS

PDF

88.0 KB Created: 2021-08-15 13:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0af8b668edd78d0b150f23839715abef SHA-1: 267f4188f779368aed767edd5e8f44905d871757 SHA-256: d82b5cf3cd0223a583aa5ce5f9200928465432698fca64e0526482c067ec7c82
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a password-protected archive tactic to conceal malicious content. The presence of numerous links to compromised CMS uploads and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to trick users into downloading and decrypting a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nffcd.org/userfiles/files/bepirigidavibipo.pdf In PDF document text
    • http://cichanski.com/Upload/file/bilufapupap.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1737549b6671db6b2a4d0faf2f7a0e22/60553943687.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e018c669---zelotasasarotigiwinow.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/660c989297d79a2ff46ccbfb3debf098/64731304472.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/27193983311.pdfIn PDF document text
    • https://tadimtursu.com/image/files/zepog.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb6220345---xukisezufewufibedovowepas.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/7881037368.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/39920757649.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vinavibitof.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ed047c69a359d06d32cd10f91afb1aad/28073485600.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/kebiba.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/79782440591.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/90433292285.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/93742796318.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0dbc49f8---diwumi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9069e76c5---26607042597.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989c9576492---fizekabukezuxoxepu.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/45476871739.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/34243615830.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9c72e77f41bac4453e8ab44a0553031/35188117139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=letasoft+sound+booster+serial+key+freePDF 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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17424 bytes
SHA-256: 736f9fb3ec6f0ef9200215e7254341eb8a5d1588d8bf6d79253d8e2fe086e8c1
font_02_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 10752 bytes
SHA-256: 16fbc3a83671e31d304ef977e88346c67fe44158415e621f18b2acd9d68133ca

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