Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6349e3df967b57…

MALICIOUS

PDF

78.5 KB Created: 2021-07-26 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02ce74f04e6acedfccfddc6e579e1f55 SHA-1: 7172f37489cf27bed6acf712abee084516b19d72 SHA-256: ba6349e3df967b57d7a00c93c45d5be7519e5cbb3219d96e23272acb02166b88
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal appearing to be phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9374a1f84.pdf In PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/29069149113.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dqcfe5o75obqirut4jiu8aceif/tejobose.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4baa5f1775fde6809651421bbddd4824/zasudijemodewameb.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93034e756---mulatasonimik.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/os7had4h4v42p6nkmmlopa0ha3/50905781302.pdfIn PDF document text
    • http://rjt1.org/upload/files/bepufexenu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aaf6be0810a62560f60fd9825f3efcd7/zumapakefapeke.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad9e6510d9c09e003b13a8e347c3b640/97517775717.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/70934738531.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210615_0C2F3707C2573248.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210605_E8B76DD3A15C2F37.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xorudusodegufod.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91902e8bc---wukofejepomuzufigesil.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/dosezewufe.pdfIn PDF document text
    • http://poorclarescork.ie/images/51680862165.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bb2f58e36---12005298867.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee3c83d8f---popufolomogasimoponilil.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qbman398217gmuhn2vkmsm1mp3/82537763809.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///xobesawalewure.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i0gbqqoopg8045ggpvmmh9bkp7/1519545706.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/merujofo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d260e82e53c---bilamulukameteruzezejeni.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/19430116458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=biochemistry+mushtaq+ahmad+vol+1+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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 16948 bytes
SHA-256: d3a57b65c9d83ce7bbdfecf8d1f0b7067da84c3e01055ca91493b98f06fbf9ce
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 11504 bytes
SHA-256: 5e3c4b1a0492ea498585fee05cef71c63653fb4d590432832ad12b6f8a551a57

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