Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5583cf608cdc52d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 20:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30631cab065d095938b14795b1b0deda SHA-1: 1cfe442b52a1709d7e47f42ee9240f5585eb54d1 SHA-256: e5583cf608cdc52d219a1e709c997f553c36a8701cd89b7de5f86eedc641f881
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to redirect users to malicious destinations. The primary purpose appears to be facilitating phishing or malware distribution through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b23840db---90980899812.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ilbipdir5foh1e05amka14d0d8/25305063594.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/garaxuzoboko.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/besobos.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/76765453610.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928dd17169d---62580757244.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/85909761930.pdfIn PDF document text
    • https://regenerateacademy.com/file/23959405923.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/56688875959.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/kpq118rv1tfv8b68mn2dj3vp1c/70122076045.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/be7f961247a28f5c5ff810bcbc086fb4/70676041976.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/4403338024.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sasibadaxifuk.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f2g2rsgmbvvvj672idu2mi3963/90806468101.pdfIn PDF document text
    • https://electroagro.es/pub/files/60449916551.pdfIn PDF document text
    • http://mega.kz/media/upload/files/26977591157.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/srlkrl7s1tffjth5liidurin53/bedar.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bp5o1bm9ta0m8rdlv3fa92o28l/33920701966.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4af3722f---kivudon.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/60156154694.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/xivojarukiwiw.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/mosulipixife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ulita+copilariei+pdf+downloadPDF link annotation
    • 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_off0000c616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 18696 bytes
SHA-256: 656ff54f66fa14eebfe8eb466b58f505c554be72c74417de169536886f12c74d
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 10540 bytes
SHA-256: b9db5157b0461a28e9aa66a44ce36efb7f976b7fc8c97813b9bdd8ff15ade8ea
font_02_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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