Malicious PDF — malware analysis report

Static analysis result for SHA-256 455ea41898bd0f5b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 322263ac50873ec9e0644e4ff2213dc6 SHA-1: 6f58018b08fa337e02ea8f6c77e3089b8006e130 SHA-256: 455ea41898bd0f5b23b0f6effdea217346302ba2cfd63f8638e51696ae3155e4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=you+got+mail PDF link annotation
    • http://cybernet-ap.com/UserFiles/File/16411937684.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/jumexa.pdfIn PDF document text
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109151527564730.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/015e7ee54958cf092b0f78165127d072/rojol.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/20808502483.pdfIn PDF document text
    • http://prmakeup.com/Image/files/16878901195.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/lalus.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/22945111155.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/wiwalafesutadolalexas.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63d57e98---lewupuzodonojevi.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/31879107173.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/65728252569.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/duridogulivubinazaziw.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolunimamaroxo.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/94910910580.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/foxutonavemuxoj.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nevojejeko.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jiwuvomedapixexegenunog.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/bokivigubuzivemekebewode.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161394554a3b18---45417184785.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/npfcrsr7hk5lu16r28nth2jda2/muwer.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/20565308307.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/fepuraje.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10028 bytes
SHA-256: 36c2539c289fcce2fa7d1e212721f9deea0cd68d2275d9e66630952656a10190
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 17148 bytes
SHA-256: 9e4f6299b5df405bff60d8193466e868faaf4a99be1e478331f6b11caa5e167d