Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d82f449e684c56…

MALICIOUS

PDF

92.4 KB Created: 2021-08-14 13:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c9f17660e1f7a34fdd83c2aa5081df7 SHA-1: 241f82c1a8d67106aa84b156d08c73009e0940b2 SHA-256: 28d82f449e684c56f0a4d0cea84eec2925c5179df61fbfecaffa5e50975b04de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://garglob.ru/uplcv?utm_term=south+park+phone+destroyer+hacked PDF link annotation
    • https://himanshikitchen.info/viking1/uploads/files/nigipadigututitebibig.pdfIn PDF document text
    • http://stylekd.ru/files/57581581543.pdfIn PDF document text
    • https://e-midas.ro/files/file/zowuxetobatekedivepafudef.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///titenunudipatexas.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fc8b875f0110cc596b224c7048f077d5/45421735856.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/38685360801.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/42204957656.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/46108002632.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/crm116ts5tg6nbgmsje83l77m2/2144149186.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/zalizo.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/bepukifagokob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2cd750152---xokejesag.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/67chvo4cbtq98kle887mah6b5h/bularigoguxezavel.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d13cc34913b3a3a265e94d32c24ad49/pesusarelogodezisizagug.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tutupa.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/86200529895.pdfIn PDF document text
    • http://gistys.com/userfiles/file/toxasemuxokeribix.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/68285646894.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/43598558824.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608298193af6e---fumilefogex.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/26d3e224ba8899b7239b5ea183510b05/96632321720.pdfIn PDF document text
    • 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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 18460 bytes
SHA-256: e161d890cd0b8de744ef8a6180136573c213d125a0e71021e2d4afeabf581789
font_01_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 5888 bytes
SHA-256: 05b236dff3942ed35cd86b08c2dc9aa02b199d753c5b774a0c6249c9411ec6c2
font_03_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 10852 bytes
SHA-256: 557c63575edd1a7583c4f74c630ecd7315a84070497ad6a9aa5c707a4ba5b025

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