Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb2c08b16515117…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 17:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27fd1696c01e180e2be749b42c310eed SHA-1: c0f9d9ec9aabccbfbfe4c8bc8bae82f1c99605e1 SHA-256: 5cb2c08b16515117c0f5b42fdf04e2d84c1c9dd46a1a143e99a10944c5b9ea43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution page. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hyunbulsa.org/~ewedd2/userfiles/file/wipopabunanoleti.pdf In PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/80573428210.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcf48067d---tawalavogi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614029911a013---23044722333.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/19284837736.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/doxim.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xudelubos.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/46485344342.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/40060472443.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/ligejusawumigugidiluza.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/tutetigugi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/doxijeloxegigega.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sukozugajofasew.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/6419946199.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wewifiko.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/72965137858.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/livefikitufanaw.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/17939519638.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/28825420429.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/59106704772.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6addafe22ce795450f45af8f78a949f6/xupozuraguwexulebola.pdfIn PDF document text
    • http://popmetre.com/news/files/74306504848.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/40989358732.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7aa506fc---43082657203.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23842560800.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kajadekug.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/2394538309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=friend+search+tool+old+version+apkPDF 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_off0000c469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 10748 bytes
SHA-256: a9a1ffc985ee7fec4408c6114487bf75bf423991544fd4660f16b585d65f947a
font_01_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17280 bytes
SHA-256: a015f6a8e6dab08ac3136a5f65fac4496dc2e4a358c434cfef9cc5043a0ef41a
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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