Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8a91206df0119a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 12:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04fc16cf5729d32229b75ab0511af738 SHA-1: ddcc859f4c510b817a5fd724feea83cc0522947f SHA-256: 3d8a91206df0119a77339dde3b046a3d3ba1fc59d5496638feeb9445085a077c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to lead users to external, potentially harmful, content. No scripts were extracted, but the URL patterns are indicative of a phishing or content-luring attack.

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 https://crysiq.ru/uplcv?utm_term=input+output+device+pdf+file PDF link annotation
    • http://iwanbim.com/userfiles/files/fobivenomogejiwaxunit.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/napidukiluvepevip.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/tajadimojedideduwawet.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/sidapibopelidoxabinoxuw.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d10cf09ba---64499273935.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/51671373391.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/jukeririvejizadunebupaxib.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981e1284345---rozitef.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/digijo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/855bcd622da835a766d7699513d075bf/61848799937.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/64981350529.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf33d69f8---vojugomozegakajav.pdfIn PDF document text
    • http://thevale.us/userimages/nobiw.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/18557201202.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e6a107660eb09549e40cb4eda150e52e/kaxomavolokujirimalexexat.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/la0cffh8ecd34non43i5e9rhpe/xamusaloniwa.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/71368627927.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/62030327694.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/16998458223.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/632f335d249c4b1c9513a711172b0aa6/60141939677.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/25164206728.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e67fc5e50cb---15082351776.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/43788443764.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_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 10300 bytes
SHA-256: 5df1d8a46196c037c990bd28fb3fff1d4f940297db3125240ebf1ffdf3b85a37
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 17340 bytes
SHA-256: 46c3af7cd45e241b1b824bd979ccec2eaead7dcc1fec7c9a95c922aa0c462f8b
font_02_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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