Malicious PDF — malware analysis report

Static analysis result for SHA-256 c590c2714a8c1e54…

MALICIOUS

PDF

134.0 KB Created: 2021-07-05 00:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e3c5cabf5a3c5069507db3b65a65a0da SHA-1: 84f054d4c37cad83b1b8d4fc2623cbc1aafe8eaa SHA-256: c590c2714a8c1e54ec465d9d78a6cfd36ef92992020bfc3d1fe619782a62830c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://texmet.pl/userimages/file/kuzuba.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b131bf84733e80bcab5c628f41213dc3/80547440362.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/89761227812.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a304e7129---2427242529.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c01a93ae0---bovuzituvezira.pdfIn PDF document text
    • https://clinicscrm.com/img/files/buresedog.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6c9ac079---31729073880.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/betofoja.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/sarep.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/kej81i5crskbr8ugl03sb1roki/sovesosabebupilip.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b59c8ac66c1983d2e60af6667d9766e0/21463561545.pdfIn PDF document text
    • https://okazionche.com/files/gojikozajetudesuwakovede.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gazigeken.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/pajunudis.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/rorakebigiwu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f6d135ac324da39f1ca8a15bb68230d9/18886963795.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc83dc0880---49907488617.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/342c562b522be34e8c6575435d6a10d3/46551102361.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8304014e---sevomogibuxodipa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686a7d12b---nidotozuxinapan.pdfIn PDF document text
    • https://activepymes.com/pub/file/57725699109.pdfIn PDF document text
    • http://dhf-china.com/d/files/14923290226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=frame+sentences+of+your+ownPDF 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_off0001ace0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE0 17436 bytes
SHA-256: 46f5e43ba50f86d2383d223facd6859281ba6364018b49564cafd17089ddf216
font_01_sfnt_off0001da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA29 10636 bytes
SHA-256: 15f46dd8a101b7362b0f3ea0c48c6ef23ea90704accaf0ac1e2ffc9a4fc2bd1b
font_02_sfnt_off0001f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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