Malicious PDF — malware analysis report

Static analysis result for SHA-256 36babf5682fac329…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 12:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbc8a1d2c8736f96f7d55178796031f1 SHA-1: 8ee22433d9bd7acad7e771d2305a7cd3f069601a SHA-256: 36babf5682fac329bc142707665d01a4843da4f3ab92af7364de24cb6a0c70a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier strongly indicated maliciousness, and the structure aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://lsphc.com/userfiles/file///53641887979.pdf In PDF document text
    • http://finalbrand.cz/upload/file/90925069358.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/gaparafa.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/26482840793.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/60764551643.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/kezezikit.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141387861f4a---61821051719.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440942559be---dododagivupazumoxenob.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/bekidu.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/35089397423.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/juzojoditekiverufufovi.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/74184433391.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/94708221809.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210915/file/58390881804.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/tadodotugu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc441b03d---buwewu.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/zitupelivilidexigukizuran.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/81096485984.pdfIn PDF document text
    • https://tdfstore.it/file/51508871415.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210918021029.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vazixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+full+movie+free+downloadPDF 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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 17700 bytes
SHA-256: 6da2e1e2746543a712f343aa630d48665438ee39074e9d2d267dcd41aadb6115
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 11276 bytes
SHA-256: c2d09fd276f1dafb43d6191e30ec8562528b712779e18f03c117fcce298a779d