Malicious PDF — malware analysis report

Static analysis result for SHA-256 63daec08be633d3a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 09:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56e90fd868e88fa4fd1b313faa63bb70 SHA-1: e46cd2721e6d4c9eb079fd0036142f0723de662a SHA-256: 63daec08be633d3ac232c6b907f98239d84d5b89d308643d549c23953124c0a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. This suggests the document is designed to act as a link farm, potentially leading users to malicious content or phishing sites. The ML classifier strongly indicated maliciousness, and the structure aligns with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082696403bd4---kubuvexes.pdf In PDF document text
    • http://irinabailey.com/upload/files/fedazedofudebip.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/fulalegamosenexawufimojel.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160803e7e03cee---40378986551.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b80caf17---funasage.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zemepagajisidapekikikos.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160defecc7c824---sadofozininu.pdfIn PDF document text
    • https://netpage.info/userfiles/file/25833491886.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nkgllb25v6b8emsbqmpqv17nd5/73934220581.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/bananojuja.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sovumozosekopomew.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0d5a11f26---takezudajepulaj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01e2ec076---razufegatujizukonezoj.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hj296dgaucctl7lghpqrt3ueu5/zapalorowirexaxu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16094979b5a76f---warevewutovojetewewejeso.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119c9aa132c7---sedegedonekujaseraruxu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210814091829.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/msste5nann6ugpkadog1sm8u4m/45009042762.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/safezakenesatula.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/kp170t4otfhivc78p8dl23osbg/33058306924.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/luligotonuge.pdfIn PDF document text
    • http://fitviewer.info/files/file/geripudagorowuboxalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pathophysiology+of+disease+lange+pdf+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_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10976 bytes
SHA-256: 55e40e227738c7a918f1a8aeeb4072717735f1eaf57e30214870a6cda53f5053
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 18144 bytes
SHA-256: dfea8ca7cdbb749d2606430a2eded7072529b301a0e8324c510c02f09fe95d66

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