Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8896eb37eafae0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 17:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 769e24bd0a7d8472f8a2283af0c6c00e SHA-1: ce671ffd82b132c2579e7011cba3cf008ab5f61c SHA-256: 4f8896eb37eafae060a97a53fe2b2bd9b929c74300e605e2e30a5847917dc829
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608759e10f099---rerukasedumusavuz.pdf In PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/58307618192.pdfIn PDF document text
    • http://chromavials.com/d/files/93723845529.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/wozezabudakagixifed.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/93866807629.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/naxapa.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sutevisexegivi.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jedh5mj9u999srsttbako3tgo7/80788022549.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/takefatotoxu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c04980f92---22146706948.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/lunikafibilokagojulapiwuk.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/223566b43c5cd866a2aae8a0083292d5/mugolarozuzutisijiriluxe.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/ribor.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/68d8hkc83pj0e3nou49jfouq9u/28909055929.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/36479697972.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59570409826.pdfIn PDF document text
    • http://12shio5.com/contents//files/82004575031.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeb2c0e20---81866793372.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/makusekisubudinovo.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/jaradiwifubevusur.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/witiwilexajizigejuf.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/koguxexoror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=halimbawa+ng+salawikain+at+kahulugan+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c2ac1bfb---radajajiruv.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_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 11000 bytes
SHA-256: fb3ac562a04f112386219d340935e69b01ee9bf4379a81ecdc2d525ca8733dcb
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 15960 bytes
SHA-256: 24645a2c30625d380e277596f67bf77cd121f23c63e73b4f0094afca4a192781
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1