Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee6aa42344ebea6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 21:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8ef67c43d893a8037ee96c75fd3446f SHA-1: 5718e2ca0df5d7b2306db66602d2245afd6da008 SHA-256: 1ee6aa42344ebea6d725ebebb0dc904a55d4ee5753365769f92ce821d10be745
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains. These URLs likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://philabc.ru/uplcv?utm_term=best+free+dialer+for+android PDF link annotation
    • http://zaun-produzent.de/userfiles/file/97479046714.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/pojiwav.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xowajagudoz.pdfIn PDF document text
    • http://iknow.pl/files/file/64680061415.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xatebubupofovigaxif.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/lixiwitu.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38755278437.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090623554899.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/31726377370.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/23863481560.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384bd9ae42---21474847079.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tarirakotexirigaz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832c729031---95117287881.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/sunufomiselobobabuzudu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2goda8s13dbon5tarscjgfmk16/kuxegurelenegominidekorul.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_144745.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/43310689124.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359019334a2---vafemudusaxazemapoza.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca02206f6---melin.pdfIn PDF document text
    • https://projetovm.com/uploads/files/noputej.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/sizuzojuwepukajojot.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/88224653624.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pobopuvamev.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/duwuxud.pdfIn PDF document text
    • http://soupworld.de/upload/file/47609868460.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1a38bcef---76566704067.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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 10400 bytes
SHA-256: 30ae3abd9a446f71c675029b7ce1e22fb42199c7c15bd313f8e9ed23025397e1
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 17260 bytes
SHA-256: 90a4eeb660a6df77c555fe3ee83013b4907716d505b88d754bb3d2eed5af98de

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