Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d83e021ee63ae32…

MALICIOUS

PDF

84.1 KB Created: 2021-08-09 09:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 282b9a6fd652f53b559d931d22059e0c SHA-1: 579f7514aa4909c470620af84356904f6d9c8f96 SHA-256: 8d83e021ee63ae320ba65712f5b655305fae837ad1d608fc1d43c3c8f567d9d7
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm serves to obscure the ultimate destination and increase the chances of a successful compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=encadrer+les+grands+nombres+cm2+exercices PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b090c89ac175bedf173d1f723560015b/27154105572.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/69993530881.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/kuribajutokazokavuwaxovi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/gupeseture.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6ca1f27c1c538cc4f5a4e6d5acbc5c9f/juwuguvime.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/iip0slqvirqg01rgl7f56mq961/21069117520.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/njcfemeon3k8ki54bm7jqasrg0/nutajodemeso.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/kerufenerole.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160879113ea7fd---69544922348.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/segiz.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/lolitolonomatetenowo.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/mivowusadotadepoxes.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2f836ade---78658030463.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/5771913970.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/77075493976.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35641195507.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nipurukudubomiximawem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b567a92383c---nigexowugotimitijeza.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/14d38ad8c43d4dd504393086340fba00/82764811532.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/57418028429.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/tonojurixanefax.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160917d4329011---62995139854.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5cdc9e8f---38164726427.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/6e33ac1be2575539d1f6730b2b77e980/69004579466.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/wazoxuxivawurafumikuju.pdfIn PDF document text
    • 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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10960 bytes
SHA-256: c1f02bee27d97026c78bf6e7cef69ec95d6b269c0e5d08a6eeabde7677c63f12
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 18408 bytes
SHA-256: 7393d908e8ef4f6b7b7e347de97d5118b096412b17413c1a1ff07318428d3f70
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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