Malicious PDF — malware analysis report

Static analysis result for SHA-256 58903a85b0cf2b7e…

MALICIOUS

PDF

93.4 KB Created: 2021-08-12 01:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 507bde084adaa260ccb77929423022b6 SHA-1: 514aaa1b8ed49c49b6deb983e8c21f93e799a2ce SHA-256: 58903a85b0cf2b7eaa587f533114bec7ceb7bf6ad68b3b4ede0a070d20ed0b33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160736ea544681---mexosugexe.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f491f780854fc71b1e03e61246d7bb4c/65380437319.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/85119489628.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bigoxumunafifut.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7auiedbobcjtqptj2coekju429/zofam.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/32092103567.pdfIn PDF document text
    • http://feg.vn/uploads/files/65370320498.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/21389a61f2b14a4159081fb225e20f19/74118881262.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jepuki.pdfIn PDF document text
    • http://bwc.lt/i/46906385562.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/bogorije1624596611.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3ef09c3836ff90c4d323844213496072/57235004351.pdfIn PDF document text
    • http://heizler.hu/files/file/99203370904.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/68bc0643d72fd901a0f264baaef82308/68143310398.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/68291193749.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af95df03502---53533206581.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/moxadominikoji.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/gosasuj.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/rokutinapokugeliparij.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/pibezine.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/72326190374.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4ad1ec5998ebde20abd57e20ce60ec75/koluxugopor.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/s8ctcguu3iuq81ldf8hh1655rf/mukevonudekolami.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zenuxixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cours+excel+fonction+si+pdfPDF 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_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 19700 bytes
SHA-256: 6637baf418b32199bee0eb9d15f286a01b30f14fb229e0d8c1083b30f338ba50
font_02_sfnt_off00014d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0B 10684 bytes
SHA-256: 82d537b64019df78a12c1861c8bbb8713f1d19a0528df515650600297d64cd4e