Malicious PDF — malware analysis report

Static analysis result for SHA-256 27908b31ce984c08…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 02:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a37090c6a823902b0b21bd449999dc6d SHA-1: d3c4731478f6f31a4a95007be000336ee3a731bb SHA-256: 27908b31ce984c081660356fc4652538f24a98daa710a0ca86fd5eb84ec72ba1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not directly executed by the PDF viewer, is often used in conjunction with other exploits or lures within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145cddf30cc0---46030541268.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gobizivadan.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8v7522omiu5peb3t9o4o84papk/44257940561.pdf
    • https://citrasas.com/ckfinder/userfiles/files/fadixe.pdf
    • http://svatba-emi.com/uploads/pages/files/90717401598.pdf
    • http://dancephoto.ru/userfiles/files/tabasoxuvarunosejokefuzek.pdf
    • https://aldurra.ly/images-editeur/img/file/totuzikeb.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416944e95ad---kebebemelom.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/danububo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614407a65f4f8---kamipuvuvobagovawupuzupuf.pdf
    • http://www.depomatrial.com/file/lomutawoguzuse.pdf
    • http://langeline.com/ckeditor/upload/files/44909857478.pdf
    • http://thevalleytrader.com/files/42440727089.pdf
    • http://verzorgingsindex.nl/images/uploads/16493455809.pdf
    • https://rowadalbyt.com/userfiles/files/61281941288.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210902155757.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/41826556805.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/bowunimagidakir.pdf
    • http://crediramasrl.it/public/file/jefabifulasaw.pdf
    • https://onecre.com/images/content/files/40241100983.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d7998d97---miworaxine.pdf
    • http://yomamasushitogo.com/uploads/files/mopokofaroferiberavof.pdf
    • https://ladymamashop.com/uploads/files/202109111549171910.pdf
    • http://annabarons.com/files/files/vekedukof.pdf
    • https://magerp.org/upload/files/jusopogakujagovol.pdf
    • http://partnercable.hu/files/36731431338.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wonder+zoo+apk+download
    • 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_off0000ddd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 16792 bytes
font_01_sfnt_off0000f5ed.bin
2fe607ab1579b695d3e4098451035ab39a6febbf77bbd2c30244b3dc86eff023
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 10260 bytes
font_02_sfnt_off00010d25.bin
0dee390074c42c0e0b168b99b2106d87cc287fb28409e15a6e81b79c9ac7b1e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 18592 bytes