Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cab83a98f5954c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 16:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf1fd2ebc6c3d5169c9ef97942453bd1 SHA-1: 19e1d95d81efe9610db34300f38754307e0f2373 SHA-256: 89cab83a98f5954c0ac97ca03f40ccc84c05edf6da3d2cc90302e1625fc4296c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=puffin+browser+free+apk PDF link annotation
    • https://bkairconditioner.cloud4demo.com/uploads/files/85701791796.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/sarikowuv.pdfIn PDF document text
    • http://julianina.dk/upload/file/8658533622.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/22915167441.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdfIn PDF document text
    • https://haidangpc.com/contents/files/witesabas.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161304139d8084---25218493310.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3d9a63d7---41841749466.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/11721878730.pdfIn PDF document text
    • https://asken.as/bilder/file/foxawudozipegil.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/040848511501.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_0134850329834D83.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/larikijapekanomilimazuvik.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd51725c778c6313e4c35b3d06c87a19/39213388689.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906205149435.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/jadimutenolujirorek.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazaxepavobe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7nhtio5ou339q3rfgc2bqc8a2i/fofapulabomizopagusi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xowejavufoduwagoxib.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/vowomidebunagowiwufopas.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/bipinusodewoludes.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xisexejekivex.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136779fc8592---pujajigegobexus.pdfIn PDF document text
    • http://neteyes.eu/editor_up/difunisuxageg.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/zuwuleketexapisarovelof.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/13472952495.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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 21936 bytes
SHA-256: 51dde2a0b8cd9de8f6ce3ad601df5701fde35afd42afd427ef35cbc130812bc0
font_01_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 10628 bytes
SHA-256: 1daadea8f082b7112e8907510f47d0a597bf37cb33abb73ec260a69569acbc82

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