Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e81ce7c9dc739d…

MALICIOUS

PDF

77.9 KB Created: 2021-08-22 02:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2674ff5ef23c551c2f95ebbf2435775b SHA-1: e2496e6a19a97fcc3894e1d32c6fe000fe34cc7c SHA-256: c4e81ce7c9dc739db5aeab6eb6fbd0019e98840bc9637cd823b3a59a8af74fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=descargar+dragon+ball+budokai+tenkaichi+3+para+ppsspp+pc PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50f21ae079f949351faae9275cbba3fc/88700948524.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7368357b---53567424314.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/58241ca0b9823b1c6d5040a270440c30/10416156886.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a5e5d8207c5f0e06b303601a3115a57c/23959452330.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/23914135094.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/62570800762.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/75467927083.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/25176898460.pdfIn PDF document text
    • https://protrialse.eu/files/files/4603395660.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/03ib2mjeqv7ldvmnas5or916dk/xoturifituw.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/36311807201.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/vikefu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69e1ed538---tajewemive.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/gakolesukev.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/legugu.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/25771937247.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/17576281711.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/48516472403.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d0e1b9ea---fotud.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/kegugojivewugurage.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k16ubfk33dbotcg5122k83q5b2/katise.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/59880796073.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210718041644_jf3pie.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bosotutorotejipidu.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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 11296 bytes
SHA-256: c4b9e3cac16a06a1cf0683ba8f3b7b3757e6129316ef3a6b91aabe1fe3cec7f8
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 17536 bytes
SHA-256: 92a7340c9ba97b2fc937ae6a58c49a019fdc518a995bcacb98f61dbbec5167e3
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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