Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eefb3b26d43e1a…

MALICIOUS

PDF

89.7 KB Created: 2021-08-09 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e340c0e8ac49305512c961a4a9c1dd57 SHA-1: a77786a017d1b51919b03e4a73ee59bbf53497c6 SHA-256: 40eefb3b26d43e1aaa0dd596038f5b66ada48c604e9d04041be278455f9e8d5d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=1992+ezgo+marathon+manual+pdf PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ae727206dd695153e9bb63dbe5f7741d/lusapetudekawoxuj.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/92431914820.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a212f38d6b3---vatij.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db8cbca8cc6fa5d5186ec22c008256c7/vumume.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jetefowajaxafadesewofego.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3314907d6---jaxuxedafena.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096969d37e90---73667343000.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/45103137765.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mtfgk5gfphuvc10lt50bq08iph/sabotanolivekezizoji.pdfIn PDF document text
    • http://mextro.de/upload/files/44707897597.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705b1ec834b---lenunojefegexobulo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/wovipufenelefefaperikesi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b8bc219e0f9977d056b74e8cb3de8371/88923285935.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/57683564007.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/79075513303.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b564296059e---jewukabo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/geranumug.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1218d21a4c---riwajarivadilazu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/26646725367.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/dosuxutetufifito.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tukomunibason.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d3694a90---80569860880.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/tajitobalusomozazogex.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34d284b91f---muwavasesesuso.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9eb01790c5757c7bad56e86a2ef9e665/76521043276.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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 17432 bytes
SHA-256: 545b879234d98624cb2aa075212cb4372100399bb36a7186ae6dc16935a26dd0
font_02_sfnt_off00013f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 11088 bytes
SHA-256: 1f0419d9dcc1ca8742d9f1fff109c1a3ea20bf3eded9c0368d6f041abe5268b1