Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64f2f4df1d5bc7c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 08:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5d8c101b28c9f84e1d71291b19790e SHA-1: b0bd3c3d60ad40d4368dbee7e1da9d9bf91c2a1a SHA-256: a64f2f4df1d5bc7c307b34d039487c02987e5fff05b8970b4846820c25500b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as malicious and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.jysunshine-hotel.com/up_files/file/libojugikuletowen.pdf In PDF document text
    • http://geteffective.biz/uploadfiles/file/xalofuxikidebu.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/26542283655.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/36336340244.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xokefivanobogi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9d3aee3---28709373266.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613594dcec618---mosigeroraxe.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vokebak.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rilupaxinat.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/11610933396.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/firoladokozidasem.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/fixovatuneliregozuz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373cca3f745---21927928928.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xorazapukelosi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vmjl5htbipggocf8fg0mdvie05/banave.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbc0b8d51---kezujeredad.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/ninarawijobowoziwijuzinis.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/zibezevibe.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/35495593581.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/45550576495.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/rupoxogagumal.pdfIn PDF document text
    • http://lgassociates.in/uploads/73656845071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tokyo+drift+full+moviePDF link annotation
    • 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10416 bytes
SHA-256: c62a7f05ecace25971cc095eb76143c5e751ceec88127b1266f7a0d2184747df
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 18568 bytes
SHA-256: 93e434dda80aeb6f0dcc4a7005e700fe152753a20f892e74d89f6f6c5bb8df7b