Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc74317677896c8…

MALICIOUS

PDF

106.5 KB Created: 2021-09-02 02:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b884d6f10d6acf2f15a142be0b2e6e62 SHA-1: 669afb3669460ef808d4491789a50cb504b3e3ec SHA-256: fcc74317677896c89834d9797114c2db655b08a7c2933f08ad29c88ff1f45b05
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories. The presence of these elements suggests an attempt to host malicious content or redirect users to phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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://agendatourvietnam.com/hinhanh/file/76706729464.pdf In PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/gexete.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/37753673437.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888a954f808---50468522351.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/450531be63762d70179eb4709c66e18b/66770638325.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be047149074---35384629193.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/rodinu.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/39635861255.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210526044321.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/8735725070.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gd4ivot61j6uk3imngq24lm8v9/lugawisexuduveg.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/xuxetij.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/supananejakikosibexi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf3449fd08---78890386847.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cko47qsl0up5hk4n9to1t6tngr/26418540714.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/95935642958.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/xizopetoboru.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/lusigevadenonibosuj.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dkcdv7vbs9t50cq1pinbfcjp43/61273306215.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/sozizavotazobekagumale.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/babokekebilatekabeviwera.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/biforemokudatusoni.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/petoxubex.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/getiduzizesedemugopisumu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982b9707dbd---zubad.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/37f179d077a8135a9f1e7fe9e5889df1/89937214569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+5+speed+manual+transmission+meanPDF 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_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15328 18180 bytes
SHA-256: 69c31057e12fdb5c45944791def570c95ca79ff85d6645fc313d25fa1ea477f2
font_02_sfnt_off000182c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C5 10884 bytes
SHA-256: 02a6c50cc0478d8576fa32e6f2bd8ad1a271cc976afc7c337c7540865b11a239

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