Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba07a7d4fa39fb24…

MALICIOUS

PDF

122.3 KB Created: 2021-07-13 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b862a6e55ed675b0e97f6dc22461f9d2 SHA-1: b783db5f375992105b40a1d22b071183973bc392 SHA-256: ba07a7d4fa39fb24a804db5223027c70db780915b008d5204ff3fa78af11105e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1eb002ab---vumitosek.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/95337987621.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160993ccfae96e---9443710841.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079011349ef7---guvuril.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5686710f8---35587667513.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/85177486617.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/15830058952.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecadd83fcc---wewisose.pdfIn PDF document text
    • http://atiksigorta.com/files/18943598098.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f6888d5---71076647808.pdfIn PDF document text
    • https://media-get.com/userfiles/files/39745663108.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/15277944337.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c6a6f74d5fa9bac1d564b5ac819d8a75/47382770740.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/76033773743.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202177155854464.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/wileda.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a31075fed7d95d13974849433cf3ee03/najolirapemusitizini.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qsks6lsd1ubk1gdrm8sbmam735/72762469442.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fc60af50bde0ead7f78e67a100333106/pujusojolifirisapu.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/10934405810.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9j7ve9lnafoqfi86qi9drkgick/22779187670.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/sobere.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7e690106---42414974824.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f81091a571b4c28fe0eb01aaa4d48c90/73746867474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+put+2+pdfs+together+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4D 18204 bytes
SHA-256: 93d2ea1e30e3112ebc0f400973e87c9a4b1a418ef451c5424067f3d4b52a43b6
font_01_sfnt_off00019e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E62 2120 bytes
SHA-256: 2e95be025794ca6d95c656902b1dee5627f7608e21846fc9264bce3f3247c357
font_02_sfnt_off0001a7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFEE 11120 bytes
SHA-256: 944871b58d84ccc5850b732cc04dca39011460ef6be9b0cf1ccf1c039da51b0b

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