Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf64c161dd3cc32…

MALICIOUS

PDF

89.5 KB Created: 2021-07-14 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 931f0f9c7ce7b5518b0d33b7741d9035 SHA-1: b0ee9e376776b5cd4e43580b6a11ab8f3e9e5d19 SHA-256: bbf64c161dd3cc32fb3f0a6858b0621a3dd8b7cc6678966aec25808ae31e04f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b606f37f6cf---41885221423.pdf In PDF document text
    • https://vayamcs.com/content_files/files/nixaxidezo.pdfIn PDF document text
    • https://renault-service.com/userfiles/renurogetejaburilidujuva.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/gejusawuxexixukevedotifur.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pamelilibagiw.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p7aa7nm6nsmuubjq3mjmefjm59/52086997624.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5718682a40---26934256124.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/kefixabekobu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d311e8a3d5f1427ed3bf5008c11c12c5/51729044482.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7da99cf1---88056986690.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607819625e711---99452008662.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901e7d92bc---sodemevobuvog.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xodosuwukajak.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f35c116a2d502fbd0ced1f8148ff9566/81241243704.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/68015564883.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/56726360251.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfd8adf8c6e5f09bc7bba31a0b473642/68277487266.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d95c1774c05951399c19d3f3fb892317/duxalozifupajaleguboti.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/voduxez.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/xebapolilabumij.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48d682c24---3593881168.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/jefosazupopemep.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3cdb74d61f90746c7cb23ea7ae9e9858/54467774169.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fokafiladiwomoferagix.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/peropegudulos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=house+for+sale+sundrive+roadPDF 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_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 17792 bytes
SHA-256: bcde7896c8ba8819f9a18af348638473251d0f0131252737f5be432d1022baff
font_02_sfnt_off00014100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14100 10404 bytes
SHA-256: a21ce616abc9ae0c8e01fb5eebfbe824bfccb2e22914e7308bcf9e58f3a0657f

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