Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8fa30aab0e19ce…

MALICIOUS

PDF

94.6 KB Created: 2021-07-25 04:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1415b594c2c9570c9476453b524998e7 SHA-1: 937cd8285a4afdbccc1ee352fc4b9892acaa4343 SHA-256: fe8fa30aab0e19cee737434db0358d0365e3fe6920320b691921c0fa1168f1ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/107e1ccc5977c9754314d1a01c4a55d5/ketilidonolozewak.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnb90nrl0m6elolnb11hm9s0d6/bolenubeburi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fcff6c2aeb38c628c57d331e5aca20a1/99182064003.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b4c07e00d316ed11e4cd395691cc542c/25259146085.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855182e17b1---laputakabijiko.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wuvotujakobexo.pdfIn PDF document text
    • https://digireg.ru/upload/xajazobi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/77704131544.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5f38seh1vrm1dhrlf8l913uffn/bojiwetukariramezawut.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2b890gjt812esfk853bdocjgg5/sedaruputalav.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/11510316713.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mozasupa.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/47174658774.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210612_F825E3A336060D3B.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/38052571018.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/33448730669.pdfIn PDF document text
    • http://kalikraft.com/images/file/28530270195.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/mofebisinej.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/807b516dcf8a8067448a78779fac1a27/kekexadosafe.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4rfu8eir1f8k7ve2fej8mgh428/72063730463.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/jejupavamosesuvat.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/78561722454.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0c68b4e---66358709426.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/vajijalibugumotaja.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac104c5217---58466015433.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa05bde24---lasaxigetoboli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+money+on+gta+5+offlinePDF 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_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10616 bytes
SHA-256: 5097a8e63220cf64eab6ef1aeade47320aef2e66448fef5ab7a62bcfdd1410c8
font_01_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE5 17516 bytes
SHA-256: 60d2532babf85766e81af18471fc4dbfa3d6613317a6ac86d21119e32527c178