Malicious PDF — malware analysis report

Static analysis result for SHA-256 21172fc9f64fe0ea…

MALICIOUS

PDF

77.2 KB Created: 2021-10-01 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df7cbb7b28c603de7e6c1dd69aa74b7c SHA-1: 17945590fe4515a48e155650c9c3846fa77948c7 SHA-256: 21172fc9f64fe0eacb3c72e105d2af8ab953364b2687906a9d874a7cebf03e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=redmi+note+10+speaker+problem PDF link annotation
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/34801222804.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4fe15da9---kudabulawobejuvuxedos.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/78242223451.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/77960807422.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/muzurarixilekopalijumisu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kowelakuxeduwoginojo.pdfIn PDF document text
    • http://veitali.com/upload/files/fanobasetajimibigufaka.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/gesajajafomajodataru.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/36545501796.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/remasoxozirosajivenitowi.pdfIn PDF document text
    • https://mcsfood.com/images/file/tisomodo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/14481373227.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/sufosasofizitirakud.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210912080340.pdfIn PDF document text
    • https://eetravel.net/file/laduxefunavoxikedokuwi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614151c9996e1---3221994320.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60829796166.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/vunorofuwuvanazonuwutevax.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/26080728614.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/62232103161.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/51043022452.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a3af74711---27428871539.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/93169326322.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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 19704 bytes
SHA-256: 97a80906489323227f5ba4d8da630ee724167c4bac83caa8e06b13d452c68902
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 11004 bytes
SHA-256: 4e563c88066654c196c06cacc578bc6230a6e6054648f4792180a73a403d75d0

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