Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca698e09cd949dda…

MALICIOUS

PDF

91.3 KB Created: 2021-09-14 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 850fd545c1e7c8a7e04624f65eff301b SHA-1: b9c1ec9a32d8c20a7ff445fa29cfc1e7a46cbcaf SHA-256: ca698e09cd949dda2eeba4ed0dcb11ac097018dd5484417140daae27cf9bd3e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://soi.icami.mx/ckfinder/userfiles/files/60321238518.pdf In PDF document text
    • https://faktxeber.ru/resimler/files/ladonutosudusasexujub.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/fukarulujulijowubik.pdfIn PDF document text
    • http://holzweiss.at/49356329145.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/15952922662.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/18416174556.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a16c0a984d073f2240836c5edc2ba329/midamizenutoxojasi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc5596b98---8271091173.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210902200331552474bejkrm.pdfIn PDF document text
    • http://tid.vn/upload/files/86763004029.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/11a79bb9717a300a55b981100675958c/65267392447.pdfIn PDF document text
    • http://oris-am.com/editor_up/78964936992.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/79188061312.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/nejuvobixuw.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/babexaluxutepokes.pdfIn PDF document text
    • http://newo.ru/files/files/kigovotovutiluferesuj.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/73455072565.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nosapogidojevoparevi.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/64294921390.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/81031809266.pdfIn PDF document text
    • https://tdfstore.it/file/gadijazuv.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/nonuveropopewowazolofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=putlocker+tv+hdPDF 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_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 17896 bytes
SHA-256: 803c2d168317e0822e42a03adca934f5d5aa18ff83890ccc4f8b82c18db249fb
font_01_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10200 bytes
SHA-256: 2fa6ae7bb683352d3383f66ad847c25ece6062c88508aba2edc34597b4740039
font_02_sfnt_off000147bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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