Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e80a43dce2060c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-14 03:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3ac1bc5555b7f237492a640adc3a754 SHA-1: 7c9e124d1296e955da16e1870aabae2cb1228d3f SHA-256: 99e80a43dce2060c686a39f0663e168c7dd52666dd8a1f82fb3c05294e7143ed
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://fese.in/ienupdimages/images/files/35167499991.pdf In PDF document text
    • https://ice-group.pl/userfiles/file/kubez.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fovunuxirire.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbe6a358a---pelisu.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/52559111658.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/97bee85a1ef38cba6bf5545b4d9db9e6/rusupotubo.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jojituduraxegibes.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109051449067408.pdfIn PDF document text
    • http://jainfarms.com/uploads/zimukavefinele.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/43805510867.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/93065371583.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/6465302689.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/27671898153.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/wikeraronoxilobaguxor.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/97091898667.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39451e7d3---koruvigaduxilumiluzerorev.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/d77620e2pcchs2k9sha6pdk5qp/xufubegugagos.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a792eb14322ecd38713312e9b7caff3b/nazodaku.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/palulosuloxesuve.pdfIn PDF document text
    • https://htchninc.com/d/files/senofalojifaril.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/14751642501.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece88206d---99161892317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+lightning+coinsPDF 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 14216 bytes
SHA-256: 97c7db31274f97538ac0b981e7346d0b35a696c32fd033179c22d174f9133a17
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 10324 bytes
SHA-256: f20d27dcb8c65f79463e31a54c9226d8fd935eeee9f3a51dd5d1c4803c1115b5
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1