Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26e834733e1c7da…

MALICIOUS

PDF

111.0 KB Created: 2021-09-02 23:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a3caa18dfce5e1dae69e213bb1118d5 SHA-1: 2c09a85155a00c655c8600d643395e086052b8e5 SHA-256: f26e834733e1c7da97a84bacc631982126233b3d61c0348b1159550ce3346d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://utpcomp.ru/uploads/files/77762129653.pdf In PDF document text
    • http://4bx.pl/public/file/jozazusedoj.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d920578ec9---dajorilane.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/wisosiwo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hir4s0l3vjaf6n91c96abd1s17/jewipotakevitipajisosux.pdfIn PDF document text
    • https://5udua.com/contents//files/redufuxi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jk3ea0tq98udke9t4mlld9acnh/zesadudideve.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/37039d6729f96a6d178393908cf6e79b/56872481234.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/77108955568.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/59584781091.pdfIn PDF document text
    • http://apple888.vn/luutru/files/99772677005.pdfIn PDF document text
    • http://dgkno.cn/upload/89738209651.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/33417679297.pdfIn PDF document text
    • https://12shio3.com/contents//files/11072971762.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/94997928321.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/70292781364.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vevaluxinujarizitepuf.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d075dcbbdc3---mogerozirisomafufopuman.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/tuteputaxekavaferepedi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a4a1af35d0f78af717355f226c5b8f31/22230902172.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/posilis.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/56734520470.pdfIn PDF document text
    • https://kham.vn/userfiles/file/1016675926.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/73333396415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=daniel+goleman+emotional+intelligence+pdf+freePDF 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_off00014d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D68 10796 bytes
SHA-256: f71a103bdd67bae8184a8ef12a957648513139f689e578d8e82f6855d066430c
font_01_sfnt_off00016601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16601 18252 bytes
SHA-256: cfa46ebaa257c23839ed7806ad71d0e8519d485fdfe387eea00943371ab230b4
font_02_sfnt_off000195de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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