Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5c168510d4dd94…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcf68c288e87642dd5cd9c8d28f1bd81 SHA-1: 1c860456b3c1892344fcbc7e9ab102b11c374d23 SHA-256: 2f5c168510d4dd944c6e5c5b1e90b8ec1f7e2734db8bcdb4102e9137047103a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lex.tj/img/file/15075637440.pdf In PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vijijas.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/zinidijejemekepafejoxa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141441d8e496---wonedojilavuwe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2ba012f8487902e4a3f4c96efc9bc18b/76927942141.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405edbaa26a---13017109731.pdfIn PDF document text
    • http://moneymaker-gold.de/files/34586010277.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/34525680609.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/66f816f7f238cab3ec477e940bf1c182/36377965368.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c3220ac3---sodazetadevigevobuwutig.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/3772741123.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/putipopizeniwa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613259b37b19f---81518972270.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nelilumid.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/6838976077.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/84654605272.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/64849916524.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/85786634024.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6857ad90d39b8dd48878311b98d94809/30406615099.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/23900595916.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/19177858311.pdfIn PDF document text
    • https://j26clean.com/upload/files/48142794308.pdfIn PDF document text
    • http://robedecreateur.com/img/files/niberid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=porter%27s+theory+of+competitive+advantage+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 11236 bytes
SHA-256: e81f535a1e8d8e98b8c84d322d759d5f62901d4b6e4f5f23b293f0e74ecea369
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 18788 bytes
SHA-256: c3fb1fcc9c136cf3c2daee110508aa4435473d5e9592dbdb697a557badb4ec7f

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