Malicious PDF — malware analysis report

Static analysis result for SHA-256 548d07c46710a707…

MALICIOUS

PDF

75.1 KB Created: 2021-07-05 17:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf90fbc44b4aaa705ac5860fc78c39c7 SHA-1: f07aa2614d594890b5cb0314c496d9c845dc9e66 SHA-256: 548d07c46710a7075cfc851e968e0655c2ce673ee91b9727026d260bdaeaa027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of link farm heuristics further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=the+lord+strong+and+mighty+lyrics PDF link annotation
    • http://bertrandetgastineaudesigners.com/userfiles/file/xozetimotawiwijaw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/45287185529.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///2776350108.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aff26d34c---futogekimas.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/62dff8f32629d2407e0db1460aaacb54/lizajele.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/37089493816.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/27d4a4b04d8226ff022e3451a32f81ee/zovagajimurefa.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/26366876325.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c047da9824---65676765131.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bajusifuwinuxolinorafe.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/muxabinof.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/xonanugod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be9f84fb7---80334644532.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/64106001561.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210630044614_myiwtm.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/redapapiradamakadu.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/40497036043.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/rajibinuzovezoxosojilovi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070bca80c7ae---74994544941.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/54942444005.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d81f02db3ebc4aa1a80d023bc01ff2ff/39450836271.pdfIn PDF document text
    • http://haai.org/upload/file/rizezon.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/35368728359.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/vugoseji.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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 10896 bytes
SHA-256: 4afa8f9ecd338f4a534779e191f6aa3a92593b29030fdd9279a6738565020098
font_01_sfnt_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 16704 bytes
SHA-256: 57b562e99179537980260766d9b4a81e2f2fbeba2492b4dd3b80f5100fe7e838
font_02_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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