Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1a01cdc60816bd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 01:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5486dfaf3588ab8fa690eb0d4cd90fbb SHA-1: 42a6bad2daf9ad640ad16f8fe218d7dc09ca691e SHA-256: 5f1a01cdc60816bd4b75a6427b39a764e9f18a0c3443825efcd3922bfba599c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites. The heuristics indicate a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+block+an+app+on+play+store PDF link annotation
    • https://xn--b8qxb801j.tw/upload/files/bekigoxefuximexiro.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/galikonufewixedopudawu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/7460346112.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/50169300296.pdfIn PDF document text
    • http://cke.hk/userfiles/93658270515.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/55217367547.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/seridipasizelijife.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/93661947338.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/33568731940.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_661FCA87395C3FF0.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kivolanubifi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161411d86764e2---lowatepelosagivasujude.pdfIn PDF document text
    • https://kimcert.org/E/file/favolukex.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/mivosemilikujiwalebotiw.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/8199495805.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vatusidimafexazixeli.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/bugoxemusufupuki.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/godarimupuwubukemewumap.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091414334713.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0d1dedb8---34329497318.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a554bd6e---muguwefidoneta.pdfIn PDF document text
    • 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10696 bytes
SHA-256: a39c1a70c88de5269e47d5361674cdf3e91ce4862b0204395b6a059c27762fdc
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 18676 bytes
SHA-256: 5cdc65e508dc97320a213ed13e718ef20db83413542f8a950207b8584f6463ec

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