Malicious PDF — malware analysis report

Static analysis result for SHA-256 89634b9538643a7e…

MALICIOUS

PDF

92.5 KB Created: 2021-08-14 00:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0f682c0b0ec7307c79e28ea329b7a00 SHA-1: d948d8eef9727b70fec66b0ea91d9aace2b43a5c SHA-256: 89634b9538643a7ebf9ebee958aea2327e77e33152ac9d0a37f7c50bbf7048af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The file also hosts a link farm pointing to various PDF files on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://thaiwoodengames.com/files/upload/files/89305614845.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/pigukogiteninelebiji.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/56761067004.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/81195311504.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210715182630.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b50fddb2c5a---xozuxuzovasimuzopesa.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/97727927716.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wikupafufenofetinuso.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kitesadunorubivolifabunon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444ef76a66---75876764604.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f6eeeae3---79573171190.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/53797129465.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cb3dc84322383320d397635e5060e09e/nowusunasefanolotapegaj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c91d4c9---kokaw.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/299e490a8a8d0a86e0bd6032ab1bfa57/76937063450.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d75da202a---legutateretalipetoxijow.pdfIn PDF document text
    • https://maturana.cl/upload/file/47897796432.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nazotefoge.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/nopakube.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094345244a34---pexefejisadipepifawuxaga.pdfIn PDF document text
    • http://sbairs.com/datas/files/gopebab.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767f32b495f---lipitufigavewi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jfp8kchro29f50u82a4v1vvbsh/82749174495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+practical+guide+to+quantitative+finance+pdfPDF 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_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 10920 bytes
SHA-256: a4db218aaafa2e5e256696d3d60d522f290fb72986e7b09f0a1f04a950bddc96
font_01_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 17216 bytes
SHA-256: 3bc2c1643f7c1107d0464b597202419123adb5447c9f383dd9b2f9ea7cfb7f4a

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