Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd866e7917dc1ca6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 09:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c46bde5dde1139681c9d6ed11976ae51 SHA-1: 4e46837c33d881ae1824d797d9f9437668e3ce55 SHA-256: bd866e7917dc1ca62876b4ebe15412b8344539371020c592110db126208cfc91
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. The heuristics indicate this JavaScript is likely used to redirect the user to a series of compromised websites, as evidenced by the numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://mentaplywood.com/images_upload/files/29034283819.pdf In PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/muwijemusiv.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu28c8dd3qpekvkua6leet1c5t/bugabewalafite.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/31022337881.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xinilamimulafi.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/47621983705.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/e421c28fce88f2de7111bdad5c20817f.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614170522928e---nomareteruwozut.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/dililejomudodaxeje.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/semeladekobefamakowixuk.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pasumabawalezawovoroga.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/88251540616.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/38843726355.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/12074019079.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca4659e3bd---74480968081.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/42908887971.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zawiburafo.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/94874762041.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/gaxud.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xukorixigosovet.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/178929664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+one+home+buttonPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c978182665---tisemawizoviti.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_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 10360 bytes
SHA-256: eac7946871fb34f5a06a6b18dfe74fa167d971f2626b7e6fe000d296dd74e73f
font_02_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 17968 bytes
SHA-256: e0e11a9e58275a62abe514e71573872ddad138768204287f13ef45c71cf8ee67

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