Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14db748bb0c4389…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d584bbae999d38e41501932a8d6100c6 SHA-1: 24f25979d499ca706052f0881419b7afea9c15c0 SHA-256: f14db748bb0c4389ac2f55aa22e1cd9a81c336d0a13171e0d17daaa1c3d0f230
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/kizamezumajujupunugetaj.pdf In PDF document text
    • https://anaksemut.com/contents/files/voridonexumesabapadin.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ca99df36f---puluxa.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96698212783.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/kixajapelixalo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b15ea19a9---71189552505.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/89037229045.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/61c3e750e504310bd121c665b56230c9/gitinokeposos.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/63qtqn8re8s7o5o4r8faburmr6/23590605854.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/50551259325.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/14249275998.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e427dcd4a---mavifemuberegavibat.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wovejodaronemepupikona.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be7802859759e37e73f1a8b2a0dcfc47/55675427312.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/93203029583.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/81910823948.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/dezupapegofime.pdfIn PDF document text
    • https://unitjaya.com/contents//files/76695141832.pdfIn PDF document text
    • https://botroul.be/uploads/degobekavazowifivijavu.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fegetozobakopuka.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/nitomamaviredoxof.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb0e09d8f---64727746326.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/fetejosiwopawejosonezuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=days+of+the+week+worksheets+printable+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_off0000baab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 11028 bytes
SHA-256: fff2650b67732fd4c1a4445a077323c1f0e7d2965b27d4e4ed5525c5947c4ace
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 16012 bytes
SHA-256: 550e23c66217a3b441e7423c789cd71cae92960d94fbde0c6e8b494c7d9c3341
font_02_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1