Malicious PDF — malware analysis report

Static analysis result for SHA-256 748750c147b7ef07…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 13:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ef7d7948c92f405b8e7d29861a78647 SHA-1: 5ebb611e57a1bd34af02d511a2209c74fdcdb398 SHA-256: 748750c147b7ef0793076563f1cf8ffac648e0246adff35f1cae0465e20cadbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to disguise malicious links as legitimate content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://medvor.ru/uplcv?utm_term=english+vocabulary+health+and+illness+pdf PDF link annotation
    • http://ciaomamma.hu/editor_up/xagajirototefuterijawujit.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/39398052256.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/19822507228.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d9c5b74445159610ce89706f9f67cf3/wuwefidi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n3ui6hjhrer6gg9e6cmu7v3g34/70183816615.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/momemibeteboxumi.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/lizipad.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/97605681413.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b20545408---97277840384.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0045143001627580570.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/jigagufupubofozilil.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/99385970865.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/movixewavofuxa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddc2d293d9---kelexubumo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4e3c7b010c7a9a6f85b47c122ecb0296/kivejejapu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/16939343188.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbe0ce4a1---zobujutesapexutox.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/29260990019.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tosofiz.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/52131071169.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210824124219957.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/50584598564.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de17009d329---guwixigowo.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_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 11304 bytes
SHA-256: 789b1053dd508617bc63acc981e41beff7bc90e2a47d53ac073f640bed4bb92e
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 21896 bytes
SHA-256: 89694658a6f4a56d28a25d26c7d1e28ea081d0a2a420e6e9e660f65f4722f71a

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