Malicious PDF — malware analysis report

Static analysis result for SHA-256 61061af508dd331e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33b399aa214b0a34604cb522d13e94e2 SHA-1: 0116a2ff998fbeff6040d19469ce90425526dc12 SHA-256: 61061af508dd331e990f46c5b38497d53a954f13dcb3e77cc5d0b6764e3da253
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 websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=aaa+games+for+android PDF link annotation
    • http://francescasciortino.it/userfiles/files/14476054165.pdfIn PDF document text
    • https://sharenkon.com/files/22742421511.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161350453ec912---77986486554.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/sixuzerowiragijubefiramab.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b64c6430232054e9d290c8a234e9a5b3/9073822893.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wizekomumovorilosige.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613750cf23ef5---44484819257.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wozowiferudadarod.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/logegokejojeregozedunelej.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210909225350.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16314910987194.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/8395497239.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc86e84e9---50126915253.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ximebuporud.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/wojudilimuxozudaj.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/29706161674.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/vifatosikitanojibixule.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bugikabibo.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210916_B21C31DD43D35A67.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89d13abc0---tumiv.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/16607746067.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/35902379595.pdfIn PDF document text
    • https://suruburi.net/mm/file/16616622464.pdfIn PDF document text
    • 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_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 17316 bytes
SHA-256: 4f9f752c07ee5a48f5dc0afa74004e34f5df90168d187a13a0d09ed3dbc323b9
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10536 bytes
SHA-256: 8f05007c11eca6531385500e2ff6123a5cefbb58cbc1e9fe2813cd22b3436005
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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