Malicious PDF — malware analysis report

Static analysis result for SHA-256 be022f0831f92591…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 04:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: af5505090bdacb5b31011553d57aa595 SHA-1: 6defbd030c891a8bef69226f282a26d679b273c2 SHA-256: be022f0831f925910f256973ad2ec9952f610592b979393381116809f7e76676
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12752641549.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614123b4297d5---piboxeruf.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/gokev.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/31926921477.pdfIn PDF document text
    • http://rockeit.com/userfiles/file/50335931210.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/masujowogusax.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/94898137036.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/62675267223.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/90131100644.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/fonawav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614f39fc74038---16287731305.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lojijum.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbdc469c8---82680921158.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/18000035693.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/775a6e4c34c847f511623bcb8c1d1140/9990351682.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/nibopibi.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/39762827626.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bexugez.pdfIn PDF document text
    • https://lecachet.fr/docs/files/kuvimovejexozojezuwepa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920061942.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141175a29d57---nujiw.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4e9da5efb---44097053278.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/4981392855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+block+inappropriate+websites+on+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/34960595576.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_off0000b0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 10816 bytes
SHA-256: bc6c717aec82c0e489451872efcbd9d9dbc88d97f6b20b65cb103e7df820bbfc
font_02_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16240 bytes
SHA-256: 9ed91daef0fcbca8c68864f471f839e89a632fa564cfcae6afd936318937350f