Malicious PDF — malware analysis report

Static analysis result for SHA-256 88762bc49857f4f5…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 09:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe350ec82772abe921824cf41cfe75ba SHA-1: 34ad69a1e31495f46699de954d80a11eda354db8 SHA-256: 88762bc49857f4f50dcda3f388007e2680e0be96a8bea672cf9785ccd44265b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://projecthouse.bg/uploads/CKfinder/files/97972100074.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608138582422c---28948743695.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b208548a3---fevuwafobemivuwudemofupik.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8297ec037---28786463447.pdf
    • http://labotinnghia.com/img/files/lexugemitilo.pdf
    • http://www.abcklima.hu//data/editorfile/doxozujusuzuvig.pdf
    • http://first-group.kr/ckupload/files/xanuzewipuxozofokoweli.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/lutizifamowufovexotewe.pdf
    • https://hse.tw/upload/file/vapamereta.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/fudakubamubegumewopobaken.pdf
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/golopufum.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38fa8a164a---zovumewelegekeradezene.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a13a9e48cc84f203bc39782898b32ebc/sijomokutexemosadafurupu.pdf
    • http://autosoftware.company/autoresponders_images/files/tipukukorotijuvo.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210606_45B9106EA503965B.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1b60b17f6---fibovipuzexivamagopas.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094555bb7051---95919354226.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/59430057672.pdf
    • http://brlairport.com/images/file/tozigojidogox.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/81e8ed16dfb971a3cf727da88c836be0/xizezo.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a98f9fa99bcd752a595f7b3d70c50547/xagowetepukimepaze.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a5ad9c45942ee400b1ef3afbda07da50/jufukosupupotiv.pdf
    • https://jagamimpi.info/contents//files/posirerodune.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=filmorago+-+free+video+editor+pro+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010805.bin
aa4eb7cb98d1aac74bd037fdb6c1851d6a31c43754e55724e98bc6f2158da423
pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10740 bytes
font_01_sfnt_off00012087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
font_02_sfnt_off00013899.bin
c7825619ff546450bbc0e85af7d50cb143b11c60e0036faa98db27d01a9971bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 17588 bytes