Malicious PDF — malware analysis report

Static analysis result for SHA-256 90327528c6edc7a7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 06:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e21a580ff5f5a102ebb2054f584c8dc SHA-1: df0518444f222fffe7a481f55278b842f170e696 SHA-256: 90327528c6edc7a721ceeece2bb0276a29711f189dce47dbaa71a02fa06a05b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://allytemp.ru/uplcv?utm_term=world+top+best+game+for+android PDF link annotation
    • http://theclubburger.com/uploads/files/43294477050.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/26332643113.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/827f30d5038876ffcdcdf7afa8cdb08d/77194341999.pdfIn PDF document text
    • http://ccshecea.org/upload/files/62949783385.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/48692688562.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6gu2c6rf8663sdumq0nob5elj6/60459160289.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c988c7eea---peleluveraxikixiw.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/virajonagin.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nopugakojeriwoxup.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/85e9493168dcad2b3ce8f56c9c1a8e27/kibuwatekinanoverikas.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/72942537078.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8082686768.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/5387612951.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/sotadiv.pdfIn PDF document text
    • http://17njl.com/userfiles/files/51432909385.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161354cb290bae---26254094561.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/rikenon.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/26203610593.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160346eaa8---xizaboguduwipomomabawex.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/36526820760.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/sonideti.pdfIn PDF document text
    • http://bibikid.ru/upload/30567269810.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/13040254925.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/35834655456.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/10779151281.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/48450369062.pdfIn PDF document text
    • http://wawa757.com/uploads/files/67842571323.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 17172 bytes
SHA-256: 602195806dd3aef840cd4c84c7198f24bd94a35273c2621e7717585b50a6eaad
font_01_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 10976 bytes
SHA-256: 4fe8a4aae994ac30375acb82247ba4cfbb23cbbc677b4c28f22b1f6a4c5937e6

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