Malicious PDF — malware analysis report

Static analysis result for SHA-256 b972bda0e013f6fe…

MALICIOUS

PDF

88.0 KB Created: 2021-07-20 01:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 515f5ce8f257ee0954535d9bbe870257 SHA-1: 09a342c8cc1419c994ca667073d2b70afcc3c624 SHA-256: b972bda0e013f6fe39c6868db15e311293457fda7300eff273d9f652c002abda
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://chonburi33.com/userfiles/file/52103989188.pdf In PDF document text
    • https://securitegenerale.tn/userfiles/file/83684738316.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/p61gsod0630eva6ek0u1mjecm4/66084654681.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5fc84dc9661167f6aa5e30cee828d430/19438041121.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e7db6d93b---datupixatotejezumaxo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ad36d990c94bd56b79e87608a6dadc36/fozizawosowoxu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/milodojuvidefozif.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5899399a01---46897959387.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kowiririrama.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/906d6d1425b07b4cac9d1603d7175e79/gasereni.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/tcfe5vgqh3mfgu9b4fpiblgl4d/puzumogujoxibewibi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/pejaxatomajomepumidubibu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d7ce7906d8a227fb55bd1007b14e8c53/xemuboretamitidolakexuvij.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/79889287080.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc3d0097---xomewep.pdfIn PDF document text
    • http://canvangdientu.com/images/file/21850629399.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/rutibigulati.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2a5af0cb---32786391847.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xajifefivujesulenegowazu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/to1faq99lnil4jo8dojsfjujh6/kideligejulura.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/nixilewoworixagovutonu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zuwojonedibit.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3dcb25be7---fozalo.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/roroxanifuxarufodin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+for+engineers+pdf+downloadPDF 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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17612 bytes
SHA-256: dd5be7fa35404b55b30f31c88bb704bd31cbc1ae8c239de959cd4e949eec5313
font_01_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 11176 bytes
SHA-256: ba796659120e1cd3cdbd4fa1109fac30e415d985e407060c2b9782c566350420

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