Malicious PDF — malware analysis report

Static analysis result for SHA-256 763ad71f13c6cfb9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 01:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 156d5e9a46893f4e334b87290da7a0c8 SHA-1: bd0f242f0df5bf4280950477a82acd9a8a0335aa SHA-256: 763ad71f13c6cfb939a9384d54732b2f40a52927f4b2c09ac0a23c4bc5e6e0be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on compromised or disposable domains. These links, often disguised with search terms like 'adobe photoshop cs3 free download', suggest a phishing or malware distribution attempt. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://synerhu.ru/uplcv?utm_term=adobe+photoshop+cs3+free+download+with+crack PDF link annotation
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/24872750732.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bomepofoxapofivikitafon.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/xizepunivasavipemawobokib.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/lufasidonulodirejukurot.pdfIn PDF document text
    • http://rcot.by/pics/files/tarukoximotebikafubesumi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lepimigujezugatobajutu.pdfIn PDF document text
    • http://centromp.it/userfiles/files/zedur.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/15837173890.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea0970c9ce---nomolegizikilivedaxi.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nafutugo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/lopinutukufebitilosos.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/30553114855.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/kemedugelukidukikagame.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/29466906878.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wodenipupobutoxagenufib.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210917041304.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mibupupujuvejixajufafati.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161433cf3d1d35---9788652549.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/46287089614.pdfIn PDF document text
    • http://naso10.com/userData/board/file/71616734947.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/sbtsueuk9t8uig9bgtdi0121u1/konotumesoguz.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/95832439182.pdfIn PDF document text
    • http://elitk.ru/_files/77766282330.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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 16828 bytes
SHA-256: 63a2d45b436528cd3254fd96d01a161062dca674c56d06034d64b2523892d190
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 11188 bytes
SHA-256: 22ba0ff44d6912573a6551d9df5b96f7d606afb763b347394819a824896bd8f4
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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