Malicious PDF — malware analysis report

Static analysis result for SHA-256 891b2017c05f47f2…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 17:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdbb610e125686dfc6672cc899206cc4 SHA-1: fbe366bfcacc2f1537e1562b8ae7d8faaf159695 SHA-256: 891b2017c05f47f245eb61379e58ddd184387b4c119e6054c99dbfccc0b74404
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the linked content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/583264c683ebe034b1ef9f987bbf36ff/64166313337.pdf
    • http://inwama4.vn/webroot/img/files/minise.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/s88i6ljhovs4bt7if1skk9qajm/kavudos.pdf
    • http://amon-syotengai.com/userfiles/file/madedefofopikuritibuga.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9153e4e7069663c4f1e8549cf965f8ae/33093353450.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/49ce212a05af74b2936ac6c3a991a0a3/92106969778.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff7adb25a---51056310175.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5093a095410418b4986b91b129572593/65194612840.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141949910b---10328331145.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7727bae---5847052238.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/597d642b89ee2d07cf8682aa87828178/dosivisazufasak.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1132813afc9dd5d8040aea9f5847661c/kowagib.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/99dd1cf779ee5d55074476180a19615e/85526827249.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47ad54ee7---savajabizagizusor.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094737d51891---waviloboxoposeratatulet.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e976a3927---wijedeniwudazobuvapi.pdf
    • http://grandp.ru/userfiles/file/wegozagubexenumag.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823eef040a2---17542401477.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160765f7aafa7a---fobezawejutesujukaba.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713fef807bc---xusaxigadaresime.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727721dd600---mejodoper.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3fccb2df2ba66ac206354c08568b3cbd/jilubedobijugasopopabogip.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098418c200c9---luzugit.pdf
    • http://mobilesamara.com/img/files/file/92125092100.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+times+did+jesus+fall+while+carrying+his+cross
    • 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_off0000f766.bin
a3ba632b3f1981c21ff4ec16d4c43429c586d552f169dd416cf5cebf9ab7fb58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17848 bytes
font_01_sfnt_off0001260c.bin
445750a9d58ff4f9b60d0274f15248a3ad8a1ebba4bc3c10d3dce070f6815edd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 11344 bytes
font_02_sfnt_off0001405c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16792 bytes