Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cf96db298b3592…

MALICIOUS

PDF

108.8 KB Created: 2021-07-22 18:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5338c87940371c98f050f267669f2e36 SHA-1: 4c7d1f203b32e119d90118fcaad08ca1ddf69f16 SHA-256: b2cf96db298b359270091f777c2da9c34b213fd8d6d84db8d843d5faf47a71e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090b84d5655a---83105709004.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adf15e11f59---mozipikadajejiwavufiruxe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/trtveqdi8srb4t0coql5haqksa/lewedawubosinawazawofe.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e39f91d3bcc---7645302648.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a0e71e89321863627a6c202e3dc89b16/didozos.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/26005163754.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/gotabupezuvavo.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/19363530372.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/138021543.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/967ab082a3d5e5bddb316408dc4d931e/42029047037.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69915955779.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dd5fad401ce996fe994333ec88d79fd/dowifiw.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab59f02c2---vefetodoforejivebaliriza.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zimivaji.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201dec4d90---sunetamupisowiroj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086922c1ade5---nurikagabosafogowudemag.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f0fc07c009b5c742072ed25b31ae99f4/1669588118.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/50010278005.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/49659213168.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/59913496980.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/pudajojakanuvakofimozop.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59626022677.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e3e1293526cc088dcf0aa5fe1e9b2de/tawavunoditoxojenuzumidi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/79444393553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=game+of+thrones+web+seriesPDF 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_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BC 20420 bytes
SHA-256: cc610e7b8313201e870d4bc355d4d3ccbab03239a8b7ca9603665bd22f592ff2
font_02_sfnt_off00018d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D07 10700 bytes
SHA-256: fb254efd64df868b2677279602cd554320e256b711d7f728c0980cd528947a35