Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf5dfe1bf941150…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 18:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b793f1d652d776749cd4445fe05e4bb8 SHA-1: 62140df60296ff9ab066d460733f13a71b4363e2 SHA-256: 5cf5dfe1bf94115060478a0cdb1cf167799af53cfff126d89da2733eff10b8f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=wheel+of+time+prime PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/wadopamodep.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/25138109504.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/58562127840.pdfIn PDF document text
    • https://palet-school.com/files/files/kukavosorurozosuxemidirez.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34f5e361e---kovelategofubapapu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/78352f6cfd4297aad9792bf099e98b77/kiwajuvisabatekugoverug.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/75488448620.pdfIn PDF document text
    • http://lblussana.it/images/file/vasanevasuk.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/zusevezofaxutazikag.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/mawaxidevumobilolapomulu.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/wexutewufugimim.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/178d3cc1eb5acc6f1f6135268eae69e3/47017271230.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/61994719819.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/tajidigavoviduzuja.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a111ac1d8---23035883997.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/guvojazabefuputumuvufop.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210623_060624.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902b7d24b82---fekefegumures.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16128792e44dba---43452496183.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6390fc779c---xipas.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/pozofawujiketubumoj.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cj5fs8supm0qht9g9ko4qc5rds/4632302126.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f75829231---63342425164.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 10180 bytes
SHA-256: 69687d82145a2184cc14fcba442b561edd53feda8965356b8d671d50a21085b2
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 18420 bytes
SHA-256: 19af3e06ddd7e1c2fa58133b7f6ca660868bbc3357882928f0f1da326359c0ad
font_02_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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