Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0740fdbadd26580…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 04:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28495f968d7f02c85e3c2796a26c3192 SHA-1: 0e71ca3f800d7df6610395cd95799fbb950b7f2f SHA-256: a0740fdbadd265808e8b4ea7367f67e2226ddfda9ee56caa5465fb762d9400ba
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are embedded, pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=minecraft+for+android+tv PDF link annotation
    • http://villaelen.it/userfiles/files/99508288636.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/69712576326.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/57728966957.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lalatinivoxexek.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb5c35543d---xabigubirabafomoseben.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/viputaxetepanezugivavu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/notizafosekiwujowusijox.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/28981021606.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/31900dfc07d9e9fe50908030faa03507/31998304082.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/jetukano.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/telabetewitoweferilegid.pdfIn PDF document text
    • http://timebymtm.com/upload/files/loserikojev.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/34625673784.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/matuzowiriw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9b877360---48354237626.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/67575467947.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11585045425.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/12317754266.pdfIn PDF document text
    • http://sdds.be/userfiles/file/89534357550.pdfIn PDF document text
    • https://nistd.in/userfiles/file/motavajorefiviwitu.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/12661575774.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dipefel.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/sorafo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/75214145346.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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10316 bytes
SHA-256: 74fefc6e3a8b7195c81b3aa93a020e31a18edfdeb7ed7baf772106ee3c35a178
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 18532 bytes
SHA-256: ef44811ef5522351c1f05953216b4a819a2b17c3a5230fe88a55b88391a86207

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