Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bffabbcb55f70c…

MALICIOUS

PDF

142.3 KB Created: 2021-07-18 00:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 624b5c671ff91e9e3eff3aea155a338a SHA-1: c54f134bf9287600d23a1eb903bc7a89f4132217 SHA-256: f8bffabbcb55f70ccae0d49a0eefb3489519ded03196935ee7db42a19740f4e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://fotojursa.cz/userfiles/file/josejidebev.pdf In PDF document text
    • http://zovsh.com/Uploadfiles/files/93258863660.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/99397599133.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffd4ca8e43---46190400192.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63409f222---kopeduporavetobajo.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/tolamagolirirakafevotiga.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/44041081298.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/31417ef00657ad277e9e9ec337d53a69/tawaroku.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xapoxupiju.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff42f2f13---89988407670.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8fbc6fb8---79989284367.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/livoniwewuwuvunaxajaw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd7ece841c---munumadanep.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/27313944348.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608926dad8399---rabajevot.pdfIn PDF document text
    • http://debden.org/userfiles/file/jesananifivakuxoxixo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cdfc577cc6ef05fe478f3b0ddf1d4ebe/gibodelakawikitujazi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/21517317146.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tujabinonanotolaf.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/xoreno.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pidilomemejuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=canon+650d+specifications+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA91 10920 bytes
SHA-256: 445dcaf65a1b8ffdf5c387d2ba7f8cde0bd02240fdf4f5905fca8d772668619d
font_01_sfnt_off0001c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C409 18800 bytes
SHA-256: b71f88872afd29a4a0c76e090e64b06a2348a1761e22eebd1cc7d5d593a22d12
font_02_sfnt_off0001f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E64 18528 bytes
SHA-256: 9214bbf6c142b989772d3f108d6808676ce013dc8088b4dc978adeba491b3b2c

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