Malicious PDF — malware analysis report

Static analysis result for SHA-256 87de59c73387d790…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 06:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0896b91cd38a0d13fe27f873b7cfb4ad SHA-1: 0856321ec7ef2c7e6b43000b27533c623ccac4bd SHA-256: 87de59c73387d790169574000847f33ab18503e7c2b40151a3fe00cdbc018da6
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely for phishing or malware distribution via these external links. The presence of embedded JavaScript further supports the execution of malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=prostatectomia+laparoscopica+pdf PDF link annotation
    • http://kantoromega.pl/userfiles/file/zixewowurikotexeralupamot.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161271c7ac6b37---toperokizi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075efb5092ea---69217482661.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce7de5335---jepokosuzut.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/61506556571.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/59933320796.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8413742f---13222235422.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/90187960706.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/38818441815.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/34122230993.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/20406038423.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092165c60fd1---nifadek.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/99345164523.pdfIn PDF document text
    • http://gibisch.info/files/files/dugajikusaruvad.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/55018542350.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/38284031456.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8263372179---nofigino.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/40247827656.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/romitoxutirofuwodopapad.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42761726931.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/77511470984.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749b9862da8---71466463060.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/42344341474.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/vugepevesirodiverexo.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/kudeviwa.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_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 10680 bytes
SHA-256: 5e7a1272de4556b89b06a07fcd0915904fe587d21e83bfbbd0815e0285161f09
font_02_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 17232 bytes
SHA-256: 4eeba58cc92780af32c43fad6bcebfff83e13abe154927e5c86aea4cb256625c

Open this report in the interactive analyzer, or submit your own file for analysis.