Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8359aab0c29d46…

MALICIOUS

PDF

107.7 KB Created: 2021-09-21 04:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8d7a155ce4b582b791b50440cabcb15 SHA-1: 5fb09fe1592573b4557df3c946a9f517158971df SHA-256: da8359aab0c29d4669c6460ea8414620e654fe301d10c0ed78c680a4df9a6543
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=paper+towns+book+download PDF link annotation
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusamepaparolemo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/xavoka.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28b7b22a8---tokiz.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xexovawijus.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b2c869ebe0813a983831133396637a37/dunarupadig.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tazevegufumerukex.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/25449392752.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d96250a3e534bd05bcfd38de8243a1c/6197084971.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/88317785993.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161438e05bc85c---bojobisosulurakosuvazivem.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/86378281340.pdfIn PDF document text
    • http://th-hl.com///upload/files/sotonatesafufopukitamu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/10102538327.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/tozewunutuvuxawegola.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb55361e---23744586048.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/82582824629.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/silubikuvir.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/vewitozabaguxogiwunita.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/jonolofadifatikolitanebu.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/tazemupigonuralusa.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/7113909854.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nimejexetirodot.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613880c39bfb9---wugapopawixavupovad.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/68322797373.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_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 10612 bytes
SHA-256: d27951171834835eec9c2591dad71ee6fb08b01904428ce68af77ea598d90072
font_02_sfnt_off00016cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCE 19696 bytes
SHA-256: db852d16a87fbf7fd73a702b20fd2a603f9f637ecd14fc9406322bf30de977ad

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