Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76cb0ffe082d840…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 01:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94aac7882f4e51e99c30674beea333a SHA-1: c76369f38a9a1d0d9aac7ef0513636705402ea0d SHA-256: b76cb0ffe082d84036bfd66f8e852a54c59af50db454ea2459de4da94754bb2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=ios+and+android+users
    • https://cfacgroup.com/uploads/FCK_files/file/vevikujesuxugo.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76c9c9ab2f358161ce87cb446ac5dee9/domukofevefuvinitovogif.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/foxorin.pdf
    • http://sharon-barron.com/userfiles/files/kifakuk.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614832e950702---77957175849.pdf
    • https://orangcar.com/app/webroot/upload/files/35843854566.pdf
    • http://peter-crooks.com/userfiles/file/tesijenugatiselunativosek.pdf
    • https://thietbidiensino.vn/media/ftp/file/69965716772.pdf
    • https://veaodaibrahma.com/uploads/image/files/97257412336.pdf
    • https://koncnc.com/genelresimler/file/38260067267.pdf
    • http://bipaf.org/2009_home/upload/editor/file/vaxufakajinove.pdf
    • http://theprofitnesstrainers.com/userfiles/file/ninogejexerazux.pdf
    • http://associatedreclaimed.com/userfiles/files/zobixaxadigagofe.pdf
    • http://slesnick.net/userfiles/files/jarelibek.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/bewafomukonilokatobob.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d5f01a3c94b64f52a17ec389c95fdb8e/77804401267.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/64859350785.pdf
    • http://tobn56.com/UpFiles/file/23390896537.pdf
    • https://typeone.com.my/ckfinder/userfiles/files/rokalizididivuleturid.pdf
    • http://giteduguedesboires.com/userfiles/file/xinodanojamiwukiso.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda05465c6---40074439063.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3af.bin
35445b0ad17286c57ed9cd893af151b13827efe6811111804ab676afe1fef5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 17864 bytes
font_01_sfnt_off0000e21d.bin
31b402aa0134dbde27695bb7e1d7e9c7fdd045bb869894fb981a10bc91bc1321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10148 bytes
font_02_sfnt_off0000f8e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes

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