Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdb053088b33ac6…

MALICIOUS

PDF

91.8 KB Created: 2021-08-22 02:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e410e3e752f3d698a7d9e13a8ca7816b SHA-1: 40878ca5fe35821f32a2d80a73f95f339c8b7633 SHA-256: 5bdb053088b33ac617e99527525421beca8170ffb97289f6b3ee1bfe36de177b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by a high number of links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or conduct phishing attacks. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://gokea.org/upload/editor/files/69017087686.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161171cf75e47d---90627437991.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/dasivujasipiluzu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jad4aoj6ohi4vs5m0g8cd7apb1/sukekomevufosu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f5caaeb7011127d2bc25f1d9c2b07a8/mamusigasom.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jumulimo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jawadatonukidezipa.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/19003965114.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/22752045747.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/98761660778.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/59852265485.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/18287560348.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/55904203409.pdfIn PDF document text
    • http://aroma--style.net/files/files/32834177476.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/3153912439.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088bab1b6053---zesep.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/38985917185.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111aa50add02---ponukaderabufunikugu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b69261f1ebe---zipanuxixipobe.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0fjcbhg13nvkb0gvnu7jec9glb/68113291770.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32c359fe09dd70f36c54e6d773cae607/polonerugog.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bd71c6dff---kiliwimokezojud.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607268afd7693---63741646365.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/fowopitosemav.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/26340549472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+gates+injection+moldingPDF 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_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 20100 bytes
SHA-256: 6c91510085a9ab808f6a59848de43cb47efa9491a5aafec1bf51df7721cb4f10
font_01_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 11068 bytes
SHA-256: bb83091767b5c55e7ebe34a2304b05cc6cc05ba534a13eb9e6f26d0c266fbfc2