Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4ddc907f34a8b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 23:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4096155e53139c3f04aad757731bde34 SHA-1: 5784c6ff5ba27f1b7898b23bab891bc0b3e526a5 SHA-256: b1f4ddc907f34a8b9082da83101c9c656123761d5c866a42b3a7af3ddf3f8bc7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, limiting the analysis to the link farm and document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://gekon.net/userfiles/file/17458243044.pdf In PDF document text
    • http://carrozzeriardue.it/userfiles/files/47182299979.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/93844a7b7c7f4a4bcf9aaf6c8c9521db/fegekabes.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/19794788962.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/90c432b8fc5cda0d0ed79eb5d52e46e4/tobekig.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b0b80bfb0337936cabfe6b68873ef185/fimanixepijujid.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4fb73a27cb3bcacd762d8320f26153ae/82189209501.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/97436007192.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9578e5b1f---vazowijorobopedulirina.pdfIn PDF document text
    • https://campermagazine.tv/public/file/suruwil.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/61f01038646f55aa96cf6ce5dfc1d154/rewodujabenetarapek.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/57654638960.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/82269079487.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/23aqvo7tdho9fuu99gs1ifosbi/jazozuvo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vevifiriperemikafavabuxu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1ef30e23a3f9859def3ded30fbf33f9f/89725608430.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f1f8124a---luxuwudebudisinimesejo.pdfIn PDF document text
    • http://silver1979.com/upload/file/17960913466.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/37165408887.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/80557922309.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16106b2cc2828a---jujumapiwedobojeko.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cecdac3e0---foxetitelonujasulomumig.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/57590909533.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/wejujapififazusapapil.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767534338f5---87489284269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=land+reform+in+zimbabwe+constraints+and+prospects+pdfPDF 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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 16072 bytes
SHA-256: 27819cf6f0e24957165f4325bb142c7eb457565a742f599d1adbd92fc491ca50
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10976 bytes
SHA-256: 32958e94dd91522932e1a6291b055dc633e1509064e3b0ec9abdae30fd31d66a
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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