Malicious PDF — malware analysis report

Static analysis result for SHA-256 b282351076972f0b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-30 06:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b319a98878cdf00726cf4b8562519b6 SHA-1: 437b54745a826ad5759d4be4f0f0702563499bdc SHA-256: b282351076972f0b86a976f84c954e4b254ecc6a9faf3ef5e42cbcda3f9be186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware delivery. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=which+elements+are+considered+transition+metals PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ada7a7352ecc22cd1b7d8f79d528b70c/90117956814.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfb24ce25---ravasesunetagonopemexab.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/kogubogorusoxurokedokoliz.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sodujadesed.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2156844a---kalinijo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/le55kpjefsn6hq0amqbfa3iijm/mavek.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/vimamebimozuxobisimiluto.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4a9dc6c9---85968128731.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/44119704184.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79722ef1ab---6533410419.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/venonetuxafinururige.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8e9ca5b5---32852770354.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/61493182872.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b2cba154a7e1f59a30ed5456836f4e8e/wivutujebodi.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/supema.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/kifosedolut.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c6c1882917f967f5dab71c2e7ed94640/69431678607.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/7431590080.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c856dc28b9d---64096343941.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/55815368747.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/90481875664.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39aa9a9d7854abd60c8cf2974e1789af/tiseduzeroputinuxuxurizam.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16103219fe2cf4---90983818300.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_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 16820 bytes
SHA-256: 6bed7f414edb3ee2bd9456e6a790950bf9ae5bf1f6e3a3c3a4127ff8bf80b283
font_01_sfnt_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 10628 bytes
SHA-256: dd2adc4da76baf885ac92cd3db462626ef6ecc96a3f1553f8bebe088928a63f0
font_02_sfnt_off00015894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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