Malicious PDF — malware analysis report

Static analysis result for SHA-256 7828d48feedf5d2d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 05:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 132239b49329a8c5ce45a23dfc719e62 SHA-1: 4a94fbd017147da7204846b07005e9472696fa64 SHA-256: 7828d48feedf5d2d60203b0d19ebae07d942c1b3a9e6537c6b6e55b81a027fa3
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 or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://biblioteka-belzec.pl/upload/files/bikogubujogafoxonet.pdf In PDF document text
    • http://pro-roubenky.cz/UserFiles/File/15494179040.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/38416413651.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/menimel.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/vujekidupesarefexib.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631121499.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nadivorawox.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/mevonafuki.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/gejezebozuko.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gimugelojezowezam.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613511a68f8da---vujagenijixemaniwobo.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210925060402.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pebewuzigatin.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/ratiganerevakikibi.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/99270514201.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161389cece49f9---25057914713.pdfIn PDF document text
    • http://onlinevay.com/upload/files/1081791891.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/65789526250.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/xekez.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zerifuxibetad.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/92844220285.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/37616860349.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573de2d377---5560247058.pdfIn PDF document text
    • https://superpart.com/files/66035009241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ps+touch+old+version+apkPDF 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 10868 bytes
SHA-256: c8eb6d69aeb42294ffe18ba8790ea6f7ce01bf508bf6faef5733f35a24eb2f77
font_02_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 17836 bytes
SHA-256: 93893a46f93e274d40222815d8beb98ea64c74703b7ba6a252bb2069a2d4651f

Open this report in the interactive analyzer, or submit your own file for analysis.