Malicious PDF — malware analysis report

Static analysis result for SHA-256 28400bed6e9e44b2…

MALICIOUS

PDF

88.5 KB Created: 2021-09-18 15:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd2f289daa6f6106d9074622774caa65 SHA-1: 25f2005e889d4a6570ecd3cf97798d8bfed04b21 SHA-256: 28400bed6e9e44b20131accd0b46d838430ea9404dab302a696258daadf70a86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=can+we+update+android+version PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/66920176313.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad2fc22e7---sujifopamiwafa.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/suzodisekazerixojasibesu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6cd2975c---88796496989.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05be146fc---sidonowupix.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/wowagibulexagebibel.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/27511259024.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/1873790404.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zovikifelafibekitifivujen.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65842109560.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xufasuzeg.pdfIn PDF document text
    • http://offerparts.com/upload/files/rasatovijevuzodi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195148558529.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/34570389080.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef1ca32236---11741744346.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/jufipugomu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/15916058767.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/36883802249.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/99397452129.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47647146561.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/vixawi.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/96588325387.pdfIn PDF document text
    • https://argumentua.com/i/file/bopijegofoka.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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10624 bytes
SHA-256: 648af1562e38239fc3217f6f0a9499822d9b6d2909ff80823062d42439087024
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 17884 bytes
SHA-256: 90e519574dd456cd748b6cd51ce7c0114efa2dd8331c2bd3c1cd326c1050b5d6
font_02_sfnt_off00013c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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