Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd5e76df183ea53…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 16:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0bf7485328e70ed53ec4049ab67982c SHA-1: 7580d134e69b23732897e861665417b25c60e945 SHA-256: dfd5e76df183ea53b7024fcfecaa1d0cac9d426da936ea89e17768b2c1880178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggests the PDF is designed to lure users to external resources. These resources are likely intended for phishing or further malware delivery.

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://agt.es/files/galeria2/files/93831977424.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kixakavelaz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1fc2020f---xuwokakokuvijivetazavux.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/legokoxut.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0be8cb7c1---27870047481.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6d3db101---48015568794.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/lapesaj.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/sarogovenofabiji.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/gulefetapurotadidoxu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148f094527cf---joropiximusubo.pdfIn PDF document text
    • http://cosyromania.com/media/file/54929254494.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fajotuzigodutezeba.pdfIn PDF document text
    • https://cargobull.cz/res/file/57214452645.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/zukebato.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tupuxowepogolura.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jiparaluleninidutiv.pdfIn PDF document text
    • http://saimiri.name/upload/file/wakozusedi.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/20619121008.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///55890501706.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/90018883740.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109091045559887.pdfIn PDF document text
    • http://mamitobe.ru/files/file/92750515621.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/woxawakupavusogosulibef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=moto+g+flash+filePDF link annotation
    • 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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 17696 bytes
SHA-256: a5a89ebd9e923ac5be4c0f97f1b780ba54e770bf0c0b87dde1ff0cbad256c7b7
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10280 bytes
SHA-256: 9e425006767449fcf87802f4c66782d1932a558368a3cedbfc4a9f0662309c6d

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