Malicious PDF — malware analysis report

Static analysis result for SHA-256 f263eac724b33a74…

MALICIOUS

PDF

84.3 KB Created: 2021-07-04 15:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a5abd343c2e2906bbc5a6f94bf042e86 SHA-1: 2211f38636b6f64703021f70b618a72f70b61739 SHA-256: f263eac724b33a747bd1e7fd812c8a9312357300192dc0b79984ee768bb2dbdd
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly supports this assessment, and the presence of multiple distinct hosts and disposable hosting patterns further reinforces the malicious intent. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc0cf6c94f28f5b0cba65e13eb7462ca/8539813291.pdf In PDF document text
    • http://imreelectric.sk/uploads/file/xatitevudigowujelejafekif.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11462b9f1---gewugidonorozosa.pdfIn PDF document text
    • https://ahha.az/userfiles/file/33398921255.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/xazumupumusojojokoxi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c17a2b580---51012122441.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/41d968a63d1bce92dcc43266dc8dc733/92959769398.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/84ab1aeb5b8b1356f2efc7f5e434380b/42972405178.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/rifutuwad.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/a480ca142b2d210205dcbe34d1e1f6e1/54291079589.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ff9cc8a3b35fcb03d0394b637748d876/velegud.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cf5edd5b4c6277358927d3b684f2b122/regez.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da66648ad63aeffc7a1e42f774a2ae45/25057225557.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/19486626857.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/buzizovabofefelubudono.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8f920be03307766c020f3d66fb9e919e/tizejeva.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bodaruzisa.pdfIn PDF document text
    • https://asiahijau.com/contents//files/fodujogojenavazi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/pupovifimimoxor.pdfIn PDF document text
    • http://wami.cc/data/files/88298717245.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd18488c5f---pubow.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/8440409726.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/24912134677.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/labixiropalotaligogubex.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff183597d---51443547215.pdfIn PDF document text
    • http://getem.plfiles/file/xirini.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb994b759---makobatepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=more+than+twist+in+my+sobriety+traductionPDF 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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 11020 bytes
SHA-256: 1602e14ba401e414ba2a41d2793abe06afef0422503a69d4780f6b9d610d706d
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 17616 bytes
SHA-256: d71c20db01d0869abb51a99b802e37b5edce53b1141cd8c0755ea5264ecf48ee

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