Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b15b3ea9775237…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 05:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e476da99a602414db40bce8d6ef3b800 SHA-1: b63d63fc625ba5630a8f3a4846e51f9a762f4d6d SHA-256: 72b15b3ea9775237d89cf79403c22b8dffe6f9c3aa50ce57c24ed091b2e97e89
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts and UTM parameters in the URLs further supports a phishing or SEO poisoning attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://oniceh.ru/uplcv?utm_term=las+artima%C3%B1as+de+satanas+pdf PDF link annotation
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/67d8df272e3bdfff61d0e7c48aa0b2d6/desumababu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1615ae6d1---xazaf.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/593cf734c999bb0e731912784b8b5bf4/34359821499.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/20978196930.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/be37e3728c4f7c64f0e4e654a18f0bef/41065781796.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/cb086fe5a8e3fa60d7356642328d9df4/zodikoxubetidujujevan.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a1a1d032---39780499661.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5csktaevio3ps31dmsmcla3pe/rijax.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/51258784949.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606e085e18e60---nawudodetapumudo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cfe8461ef1e19fa37716f7b0f2ebbbbb/gikakonumoxuleketax.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/30740625254.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/72454068408.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/zuvojetojirixedibepupod.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c317a75313b7826e323f0ff353d778c4/bolerag.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42af39ec8f---67588118986.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2b76e0e6---91233991110.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/jivapumizixobinaxemimuv.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/ximizemamupadigajeforip.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/96903786571.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/bigiso.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/kitovaku.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/mebenanuzafibofuguxi.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/47451414285.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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10656 bytes
SHA-256: 0e4ba283d295feab311d8854e132163da77a379c89b2750c8d81e6201dfbd3cf
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 18064 bytes
SHA-256: 4793b4f7f14bde1ff7f600bc5114adbe5881944019b730995a8c27784f29aa76
font_02_sfnt_off00013dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1