Malicious PDF — malware analysis report

Static analysis result for SHA-256 25309881d97a8486…

MALICIOUS

PDF

92.6 KB Created: 2021-09-19 05:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f6ae08ac073c7d6e0136257041864c8 SHA-1: ad74d9c5f6f9599f0f2b31b61704868791b5fc07 SHA-256: 25309881d97a8486d6c3e2f4bb9d07c867d2d61e3ec4e68a515abeec2a38574e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=boss+level+full+movie+123 PDF link annotation
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/90153949539.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/rubesiwawagufokarazekog.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bigovemunupirilonexejif.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3a4beb2---tuzajovelel.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6q5mh4h2o2hkasrurc0icpiv72/40177414551.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/furojegu.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912235707_yvsprj.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/84268295054.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/nunozesugekamodilub.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lijesejurukizozew.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/povidajobajapedenebufo.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/46292004531.pdfIn PDF document text
    • http://vejwun.cz/images/42051496250.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/timim.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/jiluri.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2001708c22357785bff33bdd8fba9b70/5700893224.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/fapul.pdfIn PDF document text
    • http://turatabor.hu/media/fejimapugojokapebepud.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/88552481124.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebisilisuruxajewe.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pumavadama.pdfIn PDF document text
    • http://goref.ru/files/file/simuguk.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/vowexugitudavojisojase.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10472 bytes
SHA-256: 83c9f4d61cb2115d66938de24242375bcf724c137a76dfb54ae75c3065c13413
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 19072 bytes
SHA-256: 7a6f99b949bf6bdf0ff0a0b1cc84c12d537103b7999021ce4ed9e5fb7c5e49b2
font_02_sfnt_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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