Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38d5062f2490ec1…

MALICIOUS

PDF

81.0 KB Created: 2021-10-18 03:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 02fa65c86940a8c2ebebf15a9288885a SHA-1: f9327ed91e7cfa659639a268b478bd9ea2d3a67c SHA-256: e38d5062f2490ec1dc0458c305473ca33dc39c8da593efc1fd4447fb597a0096
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. These links are likely intended to redirect users to phishing or malware distribution sites, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=torn+muscle+in+calf PDF link annotation
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xivimafabiv.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/42556638640.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/moposazo.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/bumalamirofutiwof.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/57585962220.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/pabojufevixe.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ridigugojobakidenefavane.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/tonukesat.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jadujuzejiponemanud.pdfIn PDF document text
    • https://shibbirs.com/media/files/kigawojibirazabevuvexadez.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/91522494797.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161692991c987a---91566112088.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tuwewus.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161601dc43a4f9---ziribedo.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///lokapobuvonojisaj.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/susataxuzadotuvewoxenige.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/morito.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/dasoxate.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wemanujeteziwomeperosax.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/56973638975.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad4696d6c---4546471209.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/13733057874.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelawavozerexom.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10460 bytes
SHA-256: 00562dbbf07ce41d2fe1ef4c840e1f6338fca8665bb3b1f967f88cefe94dce2f
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16584 bytes
SHA-256: 0e83a7c52844e22a8de3ab428ea986c644ca109692c92ff196ddd99ebc4e55f3

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