Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48ba4d41dbafbef…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 21:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bdfab8b01f291aa17770d402fe4e4a4 SHA-1: 90643705757159857d1778213e4975678829f232 SHA-256: e48ba4d41dbafbef9ebb2e31612d9bf692d92707bac96dab895f0e906ee40419
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://interstudy.net/userfiles/file/56955164844.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af2409520ed---geridesozimefodugofikeda.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/31559567189.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/sogegobazoda.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8ae4ee8f0becd54e47f3860860a1d172/tudufego.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/30918568510.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610930f9a8f3b---52839555466.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/wulezuweraseka.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210722050505.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/2253969305.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jisinikomupume.pdfIn PDF document text
    • https://777mto.info/contents//files/40882135309.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/758f122381258d5ff53e2cd0d9d80b9a/52192025352.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/gabapebagisasi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/86768901388.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/12602866196.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/bimilaw.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ec131ab8af0d9d0e7589dfa7321a9766/86817222485.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/pezusewebitegexokakemik.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jorajivakenomajiterovom.pdfIn PDF document text
    • http://hydrem.ru/images/file/levokageberojugebatoku.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/muforenefef.pdfIn PDF document text
    • http://espwireless.net/uploads/file/15163491991.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/lhl0sh0i4vfofbjq7kdv7rs9sm/nureronufalanozaberejepu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/feb89b33e66e5740b4e88f8da54307e9/vivufolopubavipikab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=merge+pdf+ghostscript+linuxPDF link annotation
    • 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_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 17408 bytes
SHA-256: 949300e89ff3394da9b53334b9523007b757bde11965ec12a241a960f4ae01d1
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10932 bytes
SHA-256: d4d9d8cd75b39dc8f6bcfaae0ac86487d1de5f2d8d596e0a6002a72a47c9e1d2
font_02_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.