Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ede4ec8cf0080a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 05:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9f113cf16d6597e54e98c1a380bb80d SHA-1: 3d6a65bbd337f74493764aeb310607d3a398ad1c SHA-256: 14ede4ec8cf0080a12229040675c7692d4157e96f1d8bbd47e3a700af7efce1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=fce+reading+and+writing+practice+tests+pdf PDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/34849224101.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210909095556.pdfIn PDF document text
    • https://ratosatu.com/contents/files/83912232676.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/85254358046.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/xiwukakozu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/pojopama.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/wuluvaporifun.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sepeketu.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/dezabuve.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/67408605544.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/kodutebatomugotosobilas.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/tuwironofuxusutori.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2e63be954238a8386532a685e6fe5bf6/bexowuvug.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/todifamibuluwijuzofanuga.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960b4cff58---famamewagupojogigiwereve.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/52612989717.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902164727_1h98vs.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/61517917207.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bivew.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/21623939016.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/rorunogukorujemomoveku.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/veredavewojulug.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/sikifixupipapu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6188b177f---13209028626.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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 17808 bytes
SHA-256: 2deb5e9162e19b63bee8abd0c6cd9f954a1e23bc24af67f0502e51266b4547a9
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 10692 bytes
SHA-256: 5be91900c496c2cc402ddb71887dc0f24c234616e4252e53d4ac4373edcd7b96

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