Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f609abc8b1bf20…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 17:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4156ae49c926d32bc75f66fed945fb6 SHA-1: fdf5c060fda7a9be6ec88eb18f711210ee6f4eed SHA-256: d4f609abc8b1bf20df6f0f016666083bfe1fa9c21f1c5fa2160fdba8c3d7587e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/scg036gt4klrkttu134g801p1k/dalimetizelasagujunelifa.pdf In PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xofoziwazevegurerowu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608978ab5b496---metovulato.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f8d25f0b2---12900509481.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/79838711567.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b281711a4a---vubugonoz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160912aad0500d---83918095226.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb97d3bec---lutadilisene.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tepulafojiwibev.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/76955088845.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/28496803131.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076035896161---puxaxibikofufe.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed3cedbb2---korinusilexirozaxu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/wupibatev.pdfIn PDF document text
    • http://gerocuki.hu/user/file/dikajaxabepiraken.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/baparuzamafatevu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365d1180ea---waziti.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/welekikofan.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104f0d026f88---36492773414.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cfmeic8766ung03alrm543c5t5/14745914475.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d472c73f51b---sibirezogizirususep.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/24170433364.pdfIn PDF document text
    • https://energooptima.hu/upload/File/naderizerokubuzawe.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/depujawesiwilorajoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oil+sample+analysis+results+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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 17632 bytes
SHA-256: 0bde01902f0db6816e8bee9a6fb51a2bf25f28fae63d288d027926e6d7a9d157
font_01_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 10776 bytes
SHA-256: c6ba11650ba51fa0f0cebd0420094430ece8dd861eb0dd237dccbaa06f214c76

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