Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd8f31737cc7ab…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 04:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8e14c6db7672342bd75970de818a19f SHA-1: 367974f3b26b7b079e61be395580d42538b2cd48 SHA-256: 81dd8f31737cc7ab91ef012e07c16f55cddb19ce93e92c54140cdcfddab8637c
216 Risk Score

Malware Insights

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

This PDF document impersonates a cloud document lure, likely to trick users into downloading further malicious content. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=onedrive+not+syncing+windows+10
    • http://hutbephottaihaiphong24h.com/upload/files/17242843017.pdf
    • http://daisytalavera.com/userfiles/files/migerukajezufikuje.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6559e6320c---46122391947.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/34ed3b7e23b40cd4bff8122a636a19e7/pupisopim.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de1c0f1a12a---tisuj.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3e512ec509e402139fec55e1218bd398/tuvafexefuxanojifatigonak.pdf
    • http://ziconiavip.com/uploadfck/file/25956852128.pdf
    • http://palyavalaszto.hu/teszt/upload/file/76843942596.pdf
    • http://dui-antidote.com/images/userfiles/file/xukegenujorevoz.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b960557b---26013096604.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1cm1r7ut5ha4b83kj0nhahoqdc/ligofijarepexakilavepuram.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5f4e489d---42541310910.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8e0e44c5d004db08b71e01a99b34a1ec/96273179355.pdf
    • https://cornerstonelaw.eu/userfiles//file/zapawezirupaza.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ebmmtcaqrud1svite3265iq0t/84968548245.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8957b7c783---95445746886.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160851386c9ce4---jademilasalaxedovazufaset.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3c2a3351---80410445798.pdf
    • http://raczcsalad.hu/files/49705179164.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b0786e67---sudetobapimikoge.pdf
    • http://border-inn.com/CKEdit/upload/files/lemomabetapazanudam.pdf
    • http://megat.pl/uploaded/fck_files/file/89603534786.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eca2c47d9---muwoma.pdf
    • http://tunesistudio.eu/userfiles/files/xidin.pdf
    • http://csc010.com/userfiles/file/20210608123356_nzx0lx.pdf
    • https://beatmuellerfoto.ch/userfiles/files/diradurapibegug.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_off0000ed13.bin
ace7914d0b320dbd1ac6fbfca049081f3cd8c894fe10939325e140d4665c7bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10804 bytes
font_01_sfnt_off00010608.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
font_02_sfnt_off00011e1a.bin
8223ec3168fb97d7c7a10985f975fa5f1cf72fcda8b4fe6fcffb7232e090bccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 17072 bytes

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