Malicious PDF — malware analysis report

Static analysis result for SHA-256 56358ae0082edfbb…

MALICIOUS

PDF

94.4 KB Created: 2021-08-01 05:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bfda2d30e5959889a44ccb1a1782fc3 SHA-1: c55535f77a5677791f0d3859d024fbb7e0724c66 SHA-256: 56358ae0082edfbb5f4f133236a5a4410ad36e19f8ec70b2bd871d7c8468a38a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://senseoftourism.dk/userfiles/file/bekejusizitobezumubuxi.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/8404682929.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/36092017875.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a36a58dea---98365420699.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a47d14a8f14---rafojagusudawakitebod.pdf
    • http://cafemsoffice.com/userfiles/files/98128167986.pdf
    • https://acgroupenterprise.com/userfiles/file/89991098039.pdf
    • http://refinerlink.com/userfiles/file/vobiridumenunenex.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d1246586---89522220576.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/viredekukojimewezezudof.pdf
    • http://solamsys.com/userData/board/file/54768276404.pdf
    • http://tipsclubcr.com/campannas/file/mojudefu.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8ed1bb454439d28cb8a9ef9b8b1e241c/vilovipiboxipolinifes.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/01942d823b64ea7392df57f9fa90ac8d/75715021352.pdf
    • http://biolabsrl.org/userfiles/files/pukisesan.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fa59a7899d140ea38ff8fb548db1083d/73920095458.pdf
    • https://tortugafilms.ca/adminfiles/file/xaxap.pdf
    • http://kaupa.cz/userfiles/file/57348962141.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0832eb1b---mojerezubituvarumozowof.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac0e4a0ca---gipirusilurafabat.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/711n2bi0jm8afooaomba48qd4q/xaxepujomu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b245e24b69b---37361487548.pdf
    • http://isdoor.ru/uploads/files/miwilelunogonuzix.pdf
    • http://eprdel.cz/userfiles/file/2684782600.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6f004a74e00537d05b4677a171ac9490/76792637947.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+are+1966+barbies+worth
    • 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_off00010801.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
font_01_sfnt_off00012018.bin
d79fce300449c5b7df6dd5bb5d57a50e11e5d9ecf5e966c22ca1c30560d02d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 11048 bytes
font_02_sfnt_off000139dd.bin
bd3751b49f2720a47314ff2ea8e01b19ed6263e38b97d8e2e3dfe56f6a438cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 18772 bytes