Malicious PDF — malware analysis report

Static analysis result for SHA-256 9348dfbff8afb01d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd3c86c24643ba0548b1f18122b239fe SHA-1: 3183135e4f37bd659a109610d84f88333cea7c17 SHA-256: 9348dfbff8afb01d1781d123edb4b315d178d870afa350af033768f625a6a88d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attack pattern that leverages external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=android+10+bluetooth+auto+connect PDF link annotation
    • http://sweet-sugar.de/images/uploadedimages/file/50430994854.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/ledafuligolizenomoja.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/789899284.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90208337598.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bukidabolus.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribejemepafotijoxinogiba.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/56847084319.pdfIn PDF document text
    • https://hoongnau.com/upload/files/65111903568.pdfIn PDF document text
    • https://partnermind.cz/images/files/veborivonakusavagi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sekifuxuzokalurupazosepib.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/zidadovav.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161328d8a4284a---96622103969.pdfIn PDF document text
    • http://dsfly.com/uploads/files/97443576631.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xubaxavebakotekafal.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/xopugukogipidadare.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nizilunofuzoj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/96451532281.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613976ce1122c---42021335810.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/31bd6f189bf3e362148a1822dc905da2/24677915028.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gimetaxopox.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2462986432.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/vewirujuverer.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb735c1a8a---bekep.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613953f9aa328---90467195812.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 18420 bytes
SHA-256: c43b0866877b687a7682fae54dd5773a663c73ee8651a6196b15822ae5a3b879
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10696 bytes
SHA-256: a3dc2f460135f7ce489e29ccd72f01dfc7622a1dc4e5d1d255892eb58750d5e8

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