Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7674192578703af…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 13:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f776766764a23a08f98211e651937f29 SHA-1: a1868e9f2e08d4f9d8908769100e1eeb0a51408d SHA-256: b7674192578703af21fadf59e8a93d2e22ffce04efa5bf51a49767d00f7529e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thekreativecompany.com/uploaded_files/userfiles/files/navutetubadunirilemusi.pdf
    • http://zjbfjt.com/upload/files/25212306672.pdf
    • http://simonkuehner.de/gfx/userfiles/files/zofebu.pdf
    • http://fs-select.com/images/blog/file/29434375175.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/makubidexoguvov.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gosilexudesuku.pdf
    • https://cubic.is/userfiles/file/71619697019.pdf
    • http://velo.hu/UserFiles/file/wuwozilawevuxi.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-12-11-50-35.pdf
    • http://visit-pune.com/userfiles/file/tomejimujekerijazako.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614080f95f5d6---89698123843.pdf
    • http://speaklifeiamgreatness.com/files/files/20933470961.pdf
    • http://shahgrp.com/uploads/70240543001.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/dekorozanijaji.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/kajibowezukepujugivozaz.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f584d176af5f17efe6d75647e9b88b63/2680617074.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/71900094220.pdf
    • https://deltagroup.bg/uploads/file/24247975020.pdf
    • http://akinmedical.com/uploads/file/26954550529.pdf
    • http://enewind.com/pliki/file/barebopupiz.pdf
    • http://www.vikingmaterials.com/img/zelolani.pdf
    • http://kiddeefire.com/media/userfiles/files/92506504536.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589d6ca83f---59473813387.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/vozafepilopopefamakos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ronda+latin+flipfont+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 16792 bytes
font_01_sfnt_off0000ec32.bin
ac314ac9215908da824e03ac8c65eb0e3fe05b8ca9569e2f908804bca8882026
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10228 bytes
font_02_sfnt_off00010339.bin
68bb2966ca14c82741202d6f7f0ce352044c028cb43a6e8cd57704046797d7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 17572 bytes