Malicious PDF — malware analysis report

Static analysis result for SHA-256 091bc6bc5b5483b8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 20:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f7a425b1a0e2c95811081d2fe0cbc8c SHA-1: a367285d0ff28776805ac220e65c526caaad4ccf SHA-256: 091bc6bc5b5483b847a08642be25495bf9ed57b5057da74550929cac87365e14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://gemmacapitalgroup.com/foto/file/87723140242.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41c3e6682---busanezabedij.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/numofozesaxikevo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148a041b13e9---33453442172.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/donogibawifuzuruboxud.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/75541025739.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/3519103547.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/49637701963.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ac4e8940---23302115505.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/fupafunobanigogugomez.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e727ab30f---weloxosas.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/62403817792.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/812883716.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///65413836648.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wutipajatipupak.pdfIn PDF document text
    • http://domuran.pl/files/file/xunivemebedunebadelew.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/92664421651.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/pidaninugasi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/9481261714.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db48fcc071---95363312817.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/desegizorudadovuvetuvi.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/kasidusogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=smule+magic+piano+for+androidPDF 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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 10872 bytes
SHA-256: 9dae7becffed14997cd81d99b3eccf7b3b4968823aa3765760a80519112035a8
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17724 bytes
SHA-256: dbd12e140c51313fbfe72755ea263bc952b295b7e36c33c3467ca3a1bc26b38e

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