Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54517268b1a2b88…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 14:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03c0db3230f1b4df204e87831c2b8772 SHA-1: b211722623240f0877111b369de11416b65591d2 SHA-256: f54517268b1a2b881b6ba9e0060ada944a993ca05419cbbe06f92288ea3ed7b7
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a potential download or phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inkjetartandimage.com/Uploads/file/47514762537.pdf In PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/95330408173.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/64714826559.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/tekorivalifopojuwi.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/demowepan.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60491576520.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ngn3pmg8egskhme2mdiqp7oav7/84206136069.pdfIn PDF document text
    • http://creationart.hu/files/file/8905330581.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/38095594249.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/logukolofebitakebemix.pdfIn PDF document text
    • http://prosquash.by/data/77305844788.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/sedep.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/jiwaji.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/62671567643.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • https://motoralbini.it/files/file/voreba.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vaxevumujibelimokogev.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/14282921468.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1k8gi7e4ro1g1lev0q6rp6ksr0/70849969899.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d5c2e4a21a8cd708d57acaa030a232f1/20680195762.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/57443814901.pdfIn PDF document text
    • http://rld-carbon.com/file/60909259223.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/tajagezek.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/suvefuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=3d+live+wallpaper+for+laptop+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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10552 bytes
SHA-256: fede6f8b837befd9e4243bbc55392df5203a965049a5c0993e8ba5befc0eadf5
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 18936 bytes
SHA-256: 7ebfebb0b8e455462a61f6eb109a6184059daebdcfab6ddd669c4d6278de3d14

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