Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d36956938ec86e…

MALICIOUS

PDF

74.4 KB Created: 2021-07-20 00:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2546814d3e76225dadc42c883a2bb230 SHA-1: 2f7839d776d67fc523d07393b9ba118072a9ef6d SHA-256: 45d36956938ec86efdfa02d83174c0d960b382161b3eef99a652a8160d9fb9e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the presence of numerous unknown URLs points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4df30302f---88635207443.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210623040617.pdf
    • https://autosaloncenter.com/uploads/file/96677045658.pdf
    • https://ascinfratech.com/clientprojects/trading/file/nidaxoroz.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b83f4690e7f---tozokaxixutor.pdf
    • http://holidayservicemarsala.it/userfiles/files/raxemaxo.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/sejadekodad.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/3919184037.pdf
    • http://bhs1966maui.com/clients/64750/File/derotifaz.pdf
    • http://interwork.sk/userfiles/file/miminifakabikubekabugi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb50f0e2a---wafamez.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608920f9283f0---42600060084.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7d026e797---sipidusidar.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25efe04ed---88276370690.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10cc03b4cb---xakabodifapila.pdf
    • http://agataklimowska.pl/userfiles/file/xiwujulonizonudesebuw.pdf
    • http://afghansolar.com/userfiles/file/43754362418.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4324baa03---3875479414.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d07ca3f5---60973368926.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/81b47221dacee887152e8902f0bfcf55/74723452581.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e0949bd9a96a22a65e23be4ffebb0270/23162111364.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/591ce95978191e1464fb965254a3fd40/43818651505.pdf
    • https://www.ijmsir.com/ckfinder/userfiles/files/75093957719.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+multiple+processes+and+multiple+threads+in+java
    • 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_off0000bcd3.bin
fee02d46ed825f3918264210f8851455fc430820c28400b893463ce3f913bc9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 16280 bytes
font_01_sfnt_off0000e746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 16792 bytes
font_02_sfnt_off0000ff5d.bin
47c53e8b81f05916247a0bf6efd583ff2a41bec7fdfcc494553d117f63c17199
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 11408 bytes