Malicious PDF — malware analysis report

Static analysis result for SHA-256 de10b458203804cd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 01:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7870e7395b43170585cab1c1edec6b7d SHA-1: 79b18d7921ce0aa33e3a8069fcd63a7a54fa1184 SHA-256: de10b458203804cde31bb8e2ce37a61764f8a7f8c314b1c78239441916042908
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which host further PDF documents, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=gta+5+v+mod+apk PDF link annotation
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/miworafalevopa.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tuxatuvamamimoselesati.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/54921671816.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/lelubeludogurapulojurizo.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/sixobodabipupinesadu.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/kedevamufitutodas.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/17592677450.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb18f0c27---56006235150.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6e42270d91a85730fee60faa2369faec/21842582907.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xuzisas.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914145646888.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/jutizijemixivob.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/63712789684.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jexikexe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4e094f1bb34a06460b6c0c6b8474a544/vimatobodigug.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0e5c8ecc9794bea0817ea9b98a4c8f6a/wezewezedazare.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wumofobit.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/12190330107.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/40203517475.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10244 bytes
SHA-256: 33a267942d6ce1d1b5d2a0dd10d26c8942c78a2501eb55bf2c92bc2331fa715f
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 17908 bytes
SHA-256: 8f50e198c7731f5dcd7bc0707f2500136b1b9d47effd1f1d3706225518554763

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