Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bc67482203b406…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 22:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65174be9dcc63a96fdba9c33e1c377b0 SHA-1: 84ec9b891a6ad01000e587c734e1a3cb26226274 SHA-256: e3bc67482203b40689933a4c05b00ba95ab054c4916b3c28a8304ed971237f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=trig+identities+grade+11+pdf PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f79a2393e9c9e21b2f158a9186edcb51/82547767532.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/30157875853.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vfpagtboku8gl215fphnin2267/viwemurimefetu.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/43478006415.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fisuregopeje.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d8c23d747b401218d4c677a93b69608b/24135412270.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/73947317982.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/56804562789.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/79210839263.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b86c0e14a---kijijinuvenobupej.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210523114256127.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zujuwixuvejosevag.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5bb7f7551ad3f1958e63d5f29c6553fb/20006929099.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/43419897316.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/88682995477.pdfIn PDF document text
    • https://remini.hu/userfiles/file/64540502917.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a146a07f46d---98814907371.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/juvofawotubugufi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c854bf56d5d---bojovumebeb.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/ruzavarugulo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706ba8d9c4e---gikofejufewitapoxo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4a5c1973cf7c3ad2d58ee1b3c7855323/69837890554.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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 18828 bytes
SHA-256: 3512f31c89a2871008feeeaa13569852775757c6b9d54c2b306d25086429d380
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 10520 bytes
SHA-256: aeded398009fe4537303baaba5fe85902d9db79373dea605b878858fbe6d9a18

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