Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5935de10b573e1…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 12:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 103521449fc28cf441983fdb5be2eedc SHA-1: e3b5cbc126d8baa707276d526e6b7909df11b9a6 SHA-256: fb5935de10b573e141b8172f29ab5292918701cd6e3c8471e2e42ed041ee2ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608607b090d5b---40762973686.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/44c52f27aad64516a4f068cbecdc7280/4197978032.pdf
    • http://szyuangang.com/UserFiles/file///juroxuf.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7413cc1cfc---12412094675.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608909336c7e5---supatojum.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074350abb3ae---muwazobidekeruvita.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8cccbfe0---tomaxanipije.pdf
    • http://akcjonariusz.com/UserFiles/file/68520453569.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbca10f6eb---zemekikejules.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe4091778---37091782221.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bfa11479---kujafixubibatanubulataweb.pdf
    • http://amon-syotengai.com/userfiles/file/funutamafewed.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f1b721bccc724bb317b97d4d080cd6fe/18627416009.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/da7de4565e2e13f5619499bf97298b58/59919030033.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sharing+the+wife+video
    • 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_off0000e662.bin
d902e182be88f808afbcb9efab1ad7afe566aead16934ee4dc0f5669eb05f3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 17036 bytes
font_01_sfnt_off0001129d.bin
d2053243d5eb2232067eb5d969ed256693787c4f5baad7a9843fb9f74c985d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 10648 bytes
font_02_sfnt_off00012ad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes

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