Malicious PDF — malware analysis report

Static analysis result for SHA-256 84814ef8cd218b5a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 123475bb669847a683d199722bc28f14 SHA-1: ae5ea2e4d5a8ee8739584b3a77c7e79eec4aae62 SHA-256: 84814ef8cd218b5a98d07a748752e2495876190a5d82bc996b22852693beeb3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple PDF files, some hosted on compromised WordPress sites, indicates an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.rajpuc.pl/pics/file/dakurobimonutoberofuwiv.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/faseta.pdfIn PDF document text
    • http://fxlcd.com/upload/file/mokefopilujegodub.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kofunezupe.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jikaxoziponokezu.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/24822853206.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/205722230.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a789471d0973fede4343505d501f807f/55259113728.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/wezagejepitejejugax.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/tufig.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/16928373049.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/37190918421.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/61134332587.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/77006627234.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zolizenejelolig.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/g7je2r4fl22rd1p7hnlr0snprk/rujilutipo.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/sonisorirepazisetim.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630518397.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/36927973441.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43ad34057---pukakonuwozolol.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/74850946162.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/lerebofaxowuxuvodiw.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/14006611841.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/46136040995.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/90553110485.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad33ef13d---40803513816.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/15154582925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=all+stars+2+watch+onlinePDF 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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 10516 bytes
SHA-256: d910f2a10e1c7a131957e63c8e0c8ffb85df9b9c42f0c952d4a682909a7c9771
font_02_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 14944 bytes
SHA-256: bf32201ed2fddaaf48fd6978c959c4a00b33a2f54b2abc3623f3e7d6e31f7f1b

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