Malicious PDF — malware analysis report

Static analysis result for SHA-256 df661e34b545b4bc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 04:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 118f357b325e5e7d0ec5a92d04f08ab9 SHA-1: 69c245848ae21084aeb395c91bf18301ae06869e SHA-256: df661e34b545b4bc75b303f214e96e820a749dc98d5f508a0be315382560bd35
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware delivery. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f88cfb89951e1f883b2faef2b33fa020/jajojemezidawunasibi.pdf In PDF document text
    • https://huaku3c.tw/uploads/files/202109110547085365.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161366677d7032---25815984863.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/24740307252.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/14768002529.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/sofeve.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/puxiko.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/16041184782.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/92658470711.pdfIn PDF document text
    • https://kimansion.com/uploads/file/kimenewotonusag.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/meziwaxososonitaxafimude.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/tujusopopexejafigibos.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/11897291485.pdfIn PDF document text
    • http://kant21.com/userData/board/file/70904947961.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613276ae86f3c---woguben.pdfIn PDF document text
    • http://jarosi.hu/files/file/jumonulerasage.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca4938c67---54828314261.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/falepimojogo.pdfIn PDF document text
    • http://juha.be/_files/file/11625578434.pdfIn PDF document text
    • https://ptogel2.com/contents/files/29190695163.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/juxumekinizolitupovonov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=una+cenicienta+en+la+oficina+pdfPDF link annotation
    • 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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 10352 bytes
SHA-256: c60cfacad21d2514b90d867ce38d1d025746cc02c26ae5eea4e9ee091f367b8e
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 18124 bytes
SHA-256: 5e546b5009d4eb391c8ec6f19bfbdacde3adbde8e92aacf993f9edf3031c7afd
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1