Malicious PDF — malware analysis report

Static analysis result for SHA-256 9142cd89dc0f7656…

MALICIOUS

PDF

90.3 KB Created: 2021-09-22 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 581c94e3400200e134c62f37360ab554 SHA-1: 7caa8f26ff0c2aecd4db375cef9c4e83fcbf32de SHA-256: 9142cd89dc0f7656940107305f8c1db892117134d66ad888fa9a2970bedfa03c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads, suggesting a link farm designed to host phishing pages. The heuristic 'SE_MFA_LURE' strongly indicates the document's intent to trick users into providing sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crysiq.ru/uplcv?utm_term=peliculas+espanolas+romanticas PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d4fbf9d9---57019367092.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/91878655252.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109050702319822.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/74975424702.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/46921559482.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631995815.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/84810814126.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/nujunima.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/newedujagugevusorijo.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/zejurajiluwolana.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fufulegezapizitazetegipi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eb545ac7---konipodisumi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/66616961257.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wekavuwuki.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/liwugebig.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/bepexexanodidipatumebi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d59a0f5e9---kizogefojezoduzuloto.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/53481756975.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/minuzawibisiza.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109191510113571.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140920b90a0c---82717562417.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/dizuxekebutatikalarofom.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/26004880817.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/75402739578.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/matepabanupuv.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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10636 bytes
SHA-256: b543e1ee9c1ce2fa84a10641cf0c34a3e215c90564812dfb640de06dce3a7b59
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 19268 bytes
SHA-256: 49f0d98415324a5b9c221d9113b48ca6187ef99e0bba22b56193c0478ebf87a8

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