Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ce670acdee34c4…

MALICIOUS

PDF

83.1 KB Created: 2021-07-10 05:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a841dab3c00c933f3d98b4e902c830cf SHA-1: e4ebca2c5827bd3716a387d951533f7d44f52f9e SHA-256: b8ce670acdee34c4c03e10c123ec866d20e33daeb4539f8c984c85e973c283fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+1+pdf+free+download PDF link annotation
    • http://archerelectricsupply.com/userfiles/file/ragalifovesob.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/virumoti.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4ff0e53d88090dbb17af7e73ce037e3e/52935155846.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zejotarekonudumabomiliko.pdfIn PDF document text
    • https://dm288.rs/slicice/file/68501900607.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02125356b9---fozowesulowiga.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/52875866150.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd15464d4---23067237353.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2636e1ce---54783053649.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mavexusuxekigi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/715e3f4aa6bb3b7281c6d95e5b873ec5/32097869397.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d6674bea---71080116727.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/82876889000.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5c4992b024ebff3dcb9be760d7bbfe1e/laxizugixokopi.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/24c5b5d5550c9382df480be5503d56ac/90308461632.pdfIn PDF document text
    • http://darec.sk/files/files/zajapexenaguromanovupidun.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/duzesigeliferajonuf.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/74875946703.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/71615148503.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/288325b143bb51019c6ad72b03c8ec42/8659762699.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/325537503a593314f68777206fa43c1b/27111995270.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089453713a8c---bafiluriborovumigula.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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16312 bytes
SHA-256: dac00b3a64765cfd3897bef7149050b7afd26ba1a91c7b7d32f20f42baafe383
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10748 bytes
SHA-256: 9b120a9afdab72ad7ea97f575e140d0cdbdcb3a9c84b7a94bf1440c82aae7bae
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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