Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6443b72be7de76…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 17:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 168a320af9f91b4bf177f264e5799dfc SHA-1: 177212ec76c9581cd10471777df3ce28c3799021 SHA-256: cd6443b72be7de7656f9c4c17a7093a0d1a030e2075fdd6828c83fe5b033181e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous external URIs and the nature of the detected threat suggest an attempt to lure victims to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://khodahoanglang.com/admin/webroot/upload/image/files/44654743411.pdf In PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/52703608218.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/10477479409.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/mipujegili.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/568748c47c7ec1d57f72b004ed5c7c13/87516872282.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/21d041cd7d553952b44eea9b1a39a857/besidolopojetozi.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/97528678188.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d7b0e6f---73315475207.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac824feeb33---zopagobulipazimas.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/fafurinaguxedinel.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/sedotesupajudumepumoka.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j62mbl7e4v4sov3j6gvqckub4/tobupenasumosafen.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/179f8d6e381f637e69dc12513d1553f7/33538952256.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/vebotatelozudujoleto.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/13/file/20210713_081349_191.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a63a76a3---tusamesotenujisu.pdfIn PDF document text
    • http://prmakeup.com/Image/files/40960467630.pdfIn PDF document text
    • http://caramelitos.sk/files/potadinofefizevafo.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/poxigizobusategepinoxib.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d06130968---malezabaxik.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/zilekovuxavo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/kalojozoximapugobegimof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8edeecda---wasibejizu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9e42f0bc---pamilovetinajexerololuj.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/milokofeminugukut.pdfIn PDF document text
    • https://27061010.com/uploads//files/202108120730375338.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/39618819543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=programa+elige+vivir+sano+pdfPDF 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_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 10808 bytes
SHA-256: e11a87c1c925ac669731f79b6abda9c7d51aadeff7657bf42aef43bcb7f7801d
font_01_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 18120 bytes
SHA-256: 8db05471155443d3c50f0d17d20841e5e895ee4acb9fa99a18e208152502470e

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