Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d6a42113a60c98…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 16:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9b30e02f45b7db7de8c2d6bbf9fa8c3 SHA-1: 155750c4ce54d91f5f5d8d4b9a22d8a6d02bf94c SHA-256: 52d6a42113a60c98b9c7759e56c88c2afe770e08602c536998ff4a176b1bc6fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://beijingteye.com/upload/files/38967112735.pdf In PDF document text
    • https://soechi.net/userfiles/file/51840355075.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/76814234380.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/91231366193.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/resev.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/bujugizibuwivazuwiguse.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tubiwedezetitak.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/15387305335.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/zorodawo.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/82920564750.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisinup.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42477979232.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/98238219865.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd2b2211e---31631537963.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85626413086.pdfIn PDF document text
    • https://aildf.in/userfiles/file/39533647811.pdfIn PDF document text
    • http://fkhd.cz/data/img/29995012945.pdfIn PDF document text
    • http://zeci.nl/im/image/86696379611.pdfIn PDF document text
    • http://olympusflights.com/files/files/nugibulisewakipegu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090119004324.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cc16add868cfe24a790d76846ba83182/jonobuzuvapi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/822443c8e8a122cc02e6694b1e5d2929/31291424226.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/faxuruzukibonudet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nonton+anime+iosPDF 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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 17684 bytes
SHA-256: c1b451d27b0296583ee1cb89924275ccbd3a5a76bd95364602f8cce6daac7437
font_01_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 10100 bytes
SHA-256: 6fdd17a1095a67f6fc03d3d8ad5b0d424e08292e2c0678a912507b86d4e2a65b

Open this report in the interactive analyzer, or submit your own file for analysis.