Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fda163eada8fffc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 71c2d2eed1ae19c7e33128002fdb8939 SHA-1: 2d7b89fc3a85d85f297259fa5af404b431e6b906 SHA-256: 2fda163eada8fffc4a75d89cfbebc403939c28f01e5ca60b2ebc7d08064c6b92
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a compromised upload link farm strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mumegram.com/userfiles/file/11009033408.pdf In PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/91243730446.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/nezawexixusu.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/58653915554.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e97beb29c44---xobuweresokan.pdfIn PDF document text
    • https://upaspor.com/resimler/files/11919678472.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/wetubizosiwu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16701fa82---xanuzavidemu.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/zaduna.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/6436165765.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/78666335688.pdfIn PDF document text
    • http://fruitvita.com/files/files/xewomupidefudukekevan.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/vowixujotisubanad.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22128c8f83---famuxemilub.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e26e61f342be73a0ef10a30f9f63ad56/wanadanizelovet.pdfIn PDF document text
    • http://agavietnam.com/img/files/jepovowupasogevobenonufa.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3bf8265ae42c1fa9db5f3f51fa38879e/24448516176.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/xozijopel.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bo2bvi35aqcfnm28e2o7chqkvv/wuvoforikumupejevoguza.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/27250552271.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fbf32a9c---bebevusuvevitobebi.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210709144217.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/89096889904.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c4b6ee49898d535c087a6c18a5d07a5a/tawava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=table+topic+master+questionsPDF link annotation
    • 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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 10884 bytes
SHA-256: a40561ffe1ffe62940a924f0f83e30b57de73688ee339b14a5c4ba7309730b4a
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 17340 bytes
SHA-256: 7661c697bd49ec990a8c1b95c8633771e30bf2d6ce04b7f6e89bc9ba452a86c9
font_02_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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