Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e1e5565db8d804…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 19:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44fe4669da9f2e9a321257478d714b51 SHA-1: 110b1f62c98fa2af85d14bc255adfff9451cb4d3 SHA-256: 61e1e5565db8d8048b07a5afef66f6d46d81eedd8c32d750b81526ed13e03032
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=conjuring+2+full+movie+tamil+download PDF link annotation
    • http://z-i-f.ru/userfiles/file/65298700781.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/wukololeridaramokog.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19902372963.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kigonabulegoxekesiwuzasef.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/giwuvunudazobifovovo.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/buwidifosevatiwoz.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/79106731498.pdfIn PDF document text
    • https://kimcert.net/E/file/99215661245.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/9427752726.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040753307368.pdfIn PDF document text
    • https://kimcert.com/E/file/41585100230.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/661ef9147ef9afd26e11aada3619deac/74234830521.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/xomomazimurenuwozofot.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zikixabisejadokadiwuxewe.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/74078704756.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/lalakewinovamijijugawik.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea492767e9---92974362062.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/surow.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/14616478540.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210906031950212491lv2w6g4l1n4l.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/55ac5abe76591d85084f4860737594ca/42026806699.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/nufaponevejovujuguse.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wolerobobiworasemotige.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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 11064 bytes
SHA-256: d5f2d0f8c2ba209627e14a43f223b1e2ff17b253ec2a58a6bc23ec2aaa91bb4e
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17692 bytes
SHA-256: 22acd874d894943060e7a37d7755c7c70a961770d4ac094583b12baf75a255ae
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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