Malicious PDF — malware analysis report

Static analysis result for SHA-256 04159dcd7bf57970…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 07:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc1dd5c35e10f29e98376a7adb0347e9 SHA-1: 4dc09c33c01a57fe5009c7c2621f79788447d9ee SHA-256: 04159dcd7bf57970597f959257776cd0618d391487b3026a5d7483772a42a7e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is part of a link farm designed to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://network-italia.it/file/77873681767.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28c6dc09---mudeketeruxa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbc57447d---33209999135.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c955dac76---2308620244.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210906141315_822081163.pdfIn PDF document text
    • https://mashura.co/userfiles/files/karer.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/61652305853.pdfIn PDF document text
    • https://europartner2.pl/uploads/suruvax.pdfIn PDF document text
    • http://maidichike.com/upload/files/31514067241.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/nikoxapenipumered.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/zuvevid.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33968722959.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/mudesilagiwera.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/39652681804.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090311370973499.pdfIn PDF document text
    • http://silatur.com/js/ckfinder/userfiles/files/foxafakajosabodatojafap.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/35733319747.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/nikigowofowivud.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/45cd3eeafd321ee3d4e5a96898004a49/88874675533.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36401225891.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/dopunelumuto.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/93101441855.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e6eaf8dc---gufuwefenugepidokosukulo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/43571396584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bapu+tere+karke+song+download+mp4PDF 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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 11052 bytes
SHA-256: cfe6748cdce9f802386c194c37b1a7e7a12599c00dfffa1bf2cf58ac8b5f4616
font_02_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 20284 bytes
SHA-256: 26d3905ba07bb66bb820c3c81229608bfccc03f19ead6fa3c04d8dd8767f75ec

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