Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be79a0faf51028…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 18:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d746c5bf5ed3a9e119ac4a79129ea82 SHA-1: 5be17fda94e95e5439c2ed1396de8307ee0bc6dd SHA-256: 87be79a0faf5102817fb2665c6b4acec96c2e4affc09ae60f09ed0fe6aa468b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to download a secondary payload. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/dopixifafekepujupazetob.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/30000089601.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd5098d9f8---dafipakutejozekiduguxilav.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070ddcc7abfa---96456242552.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14390718527.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f78a5bdfad318da66cdce53bad4ef98/kiloluwaxu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210713040436188.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/moxugudu.pdfPDF link annotation
    • http://daltan.hu/userfiles/file/nenexilumedovetivejox.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/86an54f8qi0lpc8t33in477a4s/tixapo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/sorufatazaxupi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/826c856cf24cdaad465f8ccbf1d203e0/vujegelufeku.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5d89af3ca---badav.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081621490373499.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/47685000763.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4a4c24eb8---36137311452.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/48794399557.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607237e3c5945---25273847103.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/60d16ea15b821d7742911bbf69fbc197/wewisopuxebaxi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5073e7106---58289931408.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610878884b750---bovarepa.pdfIn PDF document text
    • https://digireg.li/upload/zujopezuvazeguv.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c72673a6050e51a2be63cc614dde9b00/totojosoxenekifusupi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2507a0829f---47726785254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cooking+guild+osrsPDF 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 16772 bytes
SHA-256: 341bf23e78a737fd6fea3e68d799fff4dfb3f330e80cbed4acc0e0fbbc6817de
font_01_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 10252 bytes
SHA-256: 37e6bc97604c9db493efb8a534aa7229e7f34fdf911a38e4cc5064dcd234f7fd
font_02_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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