Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa27990d6fb3f54…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 12:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06f42f37cca495f2e67634baeea5db14 SHA-1: 2a832a147762bbbf1b3a28768230ca5d473cb789 SHA-256: caa27990d6fb3f54a4bb4792dd23bcb328f95c2a3d8440eff057914e87007c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://pixomot.ru/uplcv?utm_term=immortal+kombat+movie PDF link annotation
    • http://malabarisproducoes.com/arquivos/files/99688730748.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/639abe1527771e9c20df798122f0f104/92112113432.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0b206f6f---7523620477.pdfIn PDF document text
    • https://spacio.hk/attachment/file/rutixusozufi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/77d229ff3d747e114b8058bb487292e2/97411233519.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0dc2944c42992f863163672c494a0e55/68808848019.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zolominekosoxo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81ae60464---61273703132.pdfIn PDF document text
    • https://korankertas.com/contents/files/sawegotuvitodeza.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/xidexozip.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109082214209000.pdfIn PDF document text
    • https://denimder.org/resimler/files/vufasaxogaxoju.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/36913471074.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/57912977793.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/30336231191.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/71307181339.pdfIn PDF document text
    • http://eva.am/files/0939943b493b9ab1.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6cf0e1a03e1b2b4e43d3d1405bd5297f/maxokenesobivosozeba.pdfIn PDF document text
    • http://telecycling.org/files/file/46191174789.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/98fadb5dbc5ff2610f0b8c5cc9fe1294/buxufigesigo.pdfIn PDF document text
    • http://susutour.com/userfile/file/44372642392.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/jitojapenive.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409cbe08ba2---wilawobinuberejememex.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70561270185.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_off0000bef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF1 10248 bytes
SHA-256: 5399ca2524fdd07f21f25fb592f2d0635e8352da4c611051b3f1dc7b239ebe0d
font_01_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 17484 bytes
SHA-256: 811dc85dd7730bb1129c32cb709a19daaf35d947bb66a7820be41f423f96a55b
font_02_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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