Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e11dfdd3b5638…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 08:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae92c280ce43703844219f73a7a083a0 SHA-1: 11305bca9ab4091a19d08f9790bc9dc1c5de7fe8 SHA-256: fc7e11dfdd3b56383b102a7918ac724a18364a11da949e8e999e04bc3a51cc1b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics indicates a strong intent to drive traffic to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://songhong.info/userfiles/file/wowuzafapip.pdf In PDF document text
    • http://didocrosby.com/imagenes/file/7508352973.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/69363342384.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f46271e2---xibuxeza.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051503313895.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1589ec8a367c961f55046a05b8cd988c/gulodexojedowesenoba.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb75451622---48047244712.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/78151797595.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d3e74a6eae4d1baa2d6f2fe0a0ecb7dd/lelavejanoxakun.pdfIn PDF document text
    • http://eventechsite.com/files/files/zirotuwokezinasekozes.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/36395943992.pdfIn PDF document text
    • https://tepihtrava.rs//files/35873733579.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce305268bb9---fujuxamoxebexe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9644d058---sazudelu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/fiwazufasuwuxamo.pdfIn PDF document text
    • http://contua.org/userfiles/file/54727442732.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/17386583412.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/52806159640.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/27592030341.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/56747718375.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607492f709338---jogipugi.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/db544st5ak8l3h45j9lmnfducc/burabofivin.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b546a27c8---tasamozebagararirezumomo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/97238527669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=civilization+and+its+discontents+free+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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10772 bytes
SHA-256: b39067e352a7f3bee07d7398eefe9ca96789e5900dbdc3c60d62659ec8ccdd65
font_02_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 17028 bytes
SHA-256: 435240265d86010cb933c6d5e7bc1919a75087a2faf69a165db6731372039fd1

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