Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba4275561997cdb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 05:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cab3e7ed9fb26ba156181e969823fbe SHA-1: 547f77303b1fad61b2f380aa0a53548836580dfb SHA-256: bba4275561997cdb16b5f1d8f1d904feeb96bdc4b3af0b03d1882d323934efc1
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and compromised CMS upload links indicates a sophisticated attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=cpr+aha+guidelines+2017+pdf PDF link annotation
    • http://artsar.pl/userfiles/file/wizora.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fbd7863e---dewupupibo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160728e7a162ff---jatelelesisigarukuser.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/misogegawatimokapitab.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/60424144551.pdfPDF link annotation
    • http://aldara-latinoamerica.com/userfiles/file/96440824912.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/84379577761.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9ed7d118472e05a6400e555691ff8ebd/56083775140.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/modiwiwo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315b1db3dda---kotilumixujeta.pdfIn PDF document text
    • https://drlanda.hu/user/file/rukijitefurorugobi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/gurexavu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858379c83fc---16112298613.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/l0kbteg7n0607u4o85sq2oevg0/37943751929.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/kodovapewab.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22531203223.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/fomexakisod.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781f408fce5---32705693964.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d92cf578---39210757898.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/suzeji.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/7713975874.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/09daa1b97dc89e6a4b564ff5d1934802/masofipul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 19232 bytes
SHA-256: 8fb3a8a11f409cd110d6e1c7b5299ff65d1faa2b2a66542afd09ca98ea9e5228
font_01_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 11036 bytes
SHA-256: 869017f6d1fb2a5420e41992ee6bdcb0a93fbbc7b40731fd0aad442d3e701ec2

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