Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc780f07e927879…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 11:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7abbe2a179614e0f69a6fcafc328a36b SHA-1: 9ed21871a7138a1e5155edef8b2d1399a3e2c2a3 SHA-256: 0fc780f07e927879a48dd93f0c71e2cc2bf3e7b041bc9404d2590245cea479e2
196 Risk Score

Malware Insights

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

The PDF document is detected as malicious by ClamAV and an ML classifier, and it employs a social-engineering lure to prompt the user to install a browser extension or update. This is a common method for delivering malware or stealing credentials. The document also contains numerous links to potentially compromised WordPress sites, suggesting a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5f3a3gv1mj73tod5jm39baqn2n/11235100185.pdf In PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d341f3c9---vogitoferujosawotama.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1328c97944a2aca27dc1d37fd3c05f42/bovojofadanujaj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2b24b0e4---35231303462.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/31v9n8n29660ecibpgkj603v51/46119510824.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/49161138633.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbdeb1eac---49725181181.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/saron.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8b2bbdbb336c99478c223e0bc913ba8a/vekawowisumedis.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/66c6fa57e6dc2402974b033ec12cf7e0/64350774171.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/29718468435.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b8756b32e21865352173ed958fdf6b7c/bujegofazusiguvidew.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d87e9427---13135410266.pdfIn PDF document text
    • http://partnercable.hu/files/10179899932.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0de275bf---84137289942.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/520ebc8cede88ea5d7d4de3eef77bf18/37733486605.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c288c10d73d---wisebiwijegawoki.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/20647909559.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/67b42d7597ea0b4fd14874b42a625322/67394262221.pdfIn PDF document text
    • https://egf.tw/test2/images/file/20948395441.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/99399204470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=japanese+poetry+in+englishPDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 10636 bytes
SHA-256: 8547f2e906251404ac903d9571809bee7aff9d0272229be5d1c11447a7729c74
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 17352 bytes
SHA-256: 108ce321a9cc29f683d277be8588e6a700a8c4982a041aef3b100003eb4bf555
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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