Malicious PDF — malware analysis report

Static analysis result for SHA-256 4378e6797c1a0e83…

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 20:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1dba2f634e9406c3457c943c52aa6ac SHA-1: d8dab302fcea59bae8ff53f8f10663f487995e47 SHA-256: 4378e6797c1a0e837bda3026ea8a03ca3241759ba8a8cd4822ec2dcfb9b1b493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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=subset+and+proper+subset+pdf PDF link annotation
    • http://izeninfo.net/admin/upload/files/75268549048.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h93hpo9koidi4urfna0jv0g681/jupuverupuxaz.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4f5ac6b162cc565e1a7101cfc8195d29/4706358473.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/46146309399.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fdp2j5d58fedakdl4lg6lp5ap4/bevefefevagifawu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ae6b8d1e8c48c09182a8478418256c9d/kexizavukulugidanev.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/depupu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6ca4c01c6fb965fd450f24a5153dde56/17745252391.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5870875959---78809956697.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/femamagakepob.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/39487134682.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4f9c0258---felukotitopivesawijajux.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/kegilo.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/guwos.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/lokumu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163c614de51---ratisakopomemoxajepepe.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/50557591455.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/juzuxeruruzitopifaku.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112834ad8a15---74133554763.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/60a29953c7de1157b46aa8532451bf1f/68360799095.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/mudeseze.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/39342127292.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra3a8mvr301qfmf7neobarm0b2/79390338861.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/253bb5af4654b4bb224d3922586c387d/18344100931.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ef775e89fa6bbdc4bbaca391e81473ce/fogilalewozer.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 1956 bytes
SHA-256: 2e4ae92ea48c331e89ae316ea1fd836390a4823bd4e37be94a8b0a188db3397d
font_01_sfnt_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 16360 bytes
SHA-256: 838f1c3e3a868dd8b37efe280e84a9caf6269b39d32605890b71e0a6dc6102d9
font_02_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10668 bytes
SHA-256: e9fd4a1a33d6f693b81a06f4ecdba052e3ff0dc4a1c20e33542295f349795516
font_03_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 24288 bytes
SHA-256: 464b51806ce5b84014c7ba8b82d816ae253617e8698dbcf113d106c3fa74ad01
font_04_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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