Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0387d003ebf0056…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 00:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6ccb89a4c6e51ef2685df765fc48efc SHA-1: 118291c6f4c3fc0c6a763dce4de9d71559f8f109 SHA-256: c0387d003ebf00562b712bcc1f09bfabbc41aac887ab2f80406efb606ac3d3fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=silicone+mechanical+properties PDF link annotation
    • https://aarushimukhwas.idealviews.com/userfiles/files/30925572155.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/kajibowezukepujugivozaz.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/50592545239.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/35170234751.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/43538104109.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/98981808284.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tezulasezuzopovefi.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/gizodifitukuwagop.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/tasopumex.pdfIn PDF document text
    • http://medica-brno.com/files/suxofa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7cc32a1---zezazuxajixomiga.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/linuzofamidifuzoxuti.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0b1c6def042df152f3f4c67e7dcc6599/28176262242.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/17071048405.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/8065574583.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/82267117979.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109041327483042.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450473cbfdd---nirisisadananeromedikiju.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/94786119184.pdfIn PDF document text
    • https://brod-plovdiv.com/images/deneroze.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/95935439904.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vazaxovifukajuboxam.pdfIn PDF document text
    • http://haphadoor.com/upload/files/44084078903.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabumujonibiralavavina.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/belivokurinovebewe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zukexamomowobodipagilixe.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 18192 bytes
SHA-256: acf1206f96c10354e2b988461a4990a76e7cb4d45da501dbb260dbd61195edef
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10716 bytes
SHA-256: a1ed6c901801b0cff4420eaf4c1c7c3db4643c9ed0139afeb21205089d4407a2