Malicious PDF — malware analysis report

Static analysis result for SHA-256 286096a3c4779005…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 01:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73f268e8f630cb17e9a39091de4b693f SHA-1: e4df79b4127a5d8e31cb934cc9fed7d331eff911 SHA-256: 286096a3c47790050d4fe441c9f0279d3b6bd48d9f427b0bddaaa65f204db6cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress sites that appear to be hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d205687597e6d0d2664d7cd88bbb3c2/dadalot.pdf In PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/toxexelixeninag.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lemebebope.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b5c47102cc889cc1e3b35c9f396a790e/bikuvijaxijal.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/vinad.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f34e6a1d---58009328403.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/87250387892.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7a4f74e2197c9f20f97c6c08919142e7/14791304576.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/413d8bfd7170fcd6a206c6065ef7044b/95467349751.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8e87c70917b2543765af0c170b2d4c4e/bomiwu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/628706b12cc12518bb8a16a8d684991e/bomupuletatel.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/31580409168.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3h1u73iupr5fhpg2baa7qb94c7/8824859006.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160768685961db---2076180486.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606f756c71---vimaxoxusifapokukak.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/gugavuwulomukigita.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7j9f4ds36u5356ohnsdf559qpi/wuwexanumu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c76e58fdc---napemazexamavana.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bec55c923bef9337d04c9634d08faeb5/lelofot.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a1f162df---ralesasewawusezafetujepiv.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d40fb631411b37c2af3f97a7da7e05b4/lumiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+great+charlemagnePDF 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10260 bytes
SHA-256: 6ebbe59bf897d279db3375503cb6a14d6833e105199595fdf855729b0ef96432
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16988 bytes
SHA-256: 7133ae0690e99eb53af53aa3c5b2b11781b8bb6b158fb0cabc9bf249e15fe28f