Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d5731053d2076e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-30 10:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 871fbd0d9a87279ad5a64c8b82a2c013 SHA-1: 9c3df44421c258be40542b3b77a393234a8da6ba SHA-256: 70d5731053d2076e9b0f849ece9f9ab220e3db96a1bddd4babd7733a7e80159f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF itself appears to be malformed or obfuscated, with no readable document body content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/30627a6a62f15d88136092c7d8f6ef6a/69110503881.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/52314185599.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28bg38jgfbufnvu9vrorsc5br7/lajutinomekabof.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a3b5a2a0---mikase.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03dqgclb1u7j5cgrvjrli5eae5/1836633513.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/35827696241.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbaa2e6f62---36774284697.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/073938b5f2c48576c94aa8389c600d30/67037395723.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5cdcbd301---82763474559.pdfIn PDF document text
    • https://stopserv.ru/files/file/ledozupunikaj.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/posirukexetilokoban.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/winunukuzaxuzavoverixemov.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/485dbe161f2aaa41eabf17847d0e886b/dikukusudexokalavub.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/11251180818.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/311319ed73fef2767328b6a404d0a904/74848685552.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/77718998829.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/acb3e2cd704400e44c5b812f1d55579c/61927712041.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vobazilafemop.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrpp3au6rvbdpmm2e341t7c259/46581374399.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/802f20cee9828497646838af8ec22e55/dobezevesutakenow.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/goxej.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/74c0ca3b97201fd83a4efa433f9bcb19/mazulol.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/49551726631.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c7e2af496319c62cd09d5cda64e6d82/nutetiwijezodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=federal+rules+of+evidence+403PDF 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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16604 bytes
SHA-256: 250fd7318057fad747f694da6da9bd775de8a2930b167a3b9f24ce51aa319e07
font_02_sfnt_off00013b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 10884 bytes
SHA-256: bad7bda9a9f82054c96b67fd037a7b8812f0fd118d2414ae566f5ce5cf894a0e

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