Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7577a84b506d835…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 07:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aa41aac5ea069f1581198f5bb235320 SHA-1: e6c7f33e163fb82f6750c2365d8062c5e4beeff4 SHA-256: f7577a84b506d835aaa7ea96e71e8025aec945a6a7cf957965da73a4e9f51c32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2524819bc---63438342841.pdf
    • http://shinies.ru/img/lib/file/kuxoxazasefop.pdf
    • https://weeb.nu/userfiles/file/81274723966.pdf
    • http://exmar.it/foto_fck/file/mibiwofoli.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/61024678068.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081148fa31e9---nexugozidazuwekufozudo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718a42b6ffe---zewuko.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/423ccc8977a794f0a8b0546cd22d2561/bosuxiwutef.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m6l4v125fojcl7686r4c402qv8/8802275246.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97361416695.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/87561276142.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/13260584085.pdf
    • http://daeryuhealthcare.com/ckupload/files/besawalopavakosogu.pdf
    • http://bocghebinhduong.com/media/ftp/file/jutunowebovig.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b797c0df24---54740143314.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bdc1ad36b---89554651715.pdf
    • https://bandai-k.com/userfiles/file/letekizatugezipovekanil.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1ed9e0fc9---25171947642.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b48f2853---18685214141.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3nmvm8itv99fbvtuheg7urdevh/75606142691.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/t4dacmqt6gr47h0qkr8dh9grb2/birewog.pdf
    • http://davidlbrooks.com/clients/868292/File/1095965543.pdf
    • https://imotrading.com/images/userfiles/balipejunirusemelopofu.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/317280fcbb4716fde75130712f7a8912/lekawafidon.pdf
    • http://daoltrading.com/userData/board/file/tubuvupusabalira.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=song+opm+love+song
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010001.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 16792 bytes
font_01_sfnt_off00011813.bin
1bebee308923ae7fae20132d96ea84fadf096953b85a79dea1885bd690e3db6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 18172 bytes
font_02_sfnt_off0001474c.bin
d6ce43bad63bb540abbdbe14806c90be83373c56a3ade819d842904e5eeae239
pdf-font-stream PDF embedded font (sfnt) at offset 0x1474C 10284 bytes