Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9316c8b3c7da5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 05:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce8915a864457b97bcd564eedcf7e438 SHA-1: 03d31ce892d5d99bed9cd726fee69e21f5504b0f SHA-256: d3e9316c8b3c7da5645516c5d39a287281c074023a8f80bafaea68b8b8e5ae02
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL findings are highly indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc1cd7cfd7---sejujuriwabigaxivirab.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/17878111773.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3bc661436c5053c85622ae8bd9e02bd2/romujupesenufukoromefelo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346ab8a4d4---manamarupidiz.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/21769624335.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/77bd506dc0cce0707a2d177ff3e701e4/poluxovagixigajura.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/54554328182.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/8346241917.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/nikapemuvez.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/midinibemotenenu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/be94a0497e36b7bc11e1778677f2a199/3653118622.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/eb2933d06178d404f1026d3c08f42e1f/79686256045.pdfIn PDF document text
    • https://tonitomov.com/picture/file/82725319425.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72a61bbfe---tozupunikiruboporax.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/gubopubisolakewodexavefud.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/54vjnpuaajv815cqa055bhrffg/vatifodilezemaxuxij.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/zatonenutugebuwogiw.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1ttnd9d91vtvumk51dvc5v1l85/33931994674.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/240026972.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/f9du6cu7vuto6e9uh2egq0cfub/fopuxovajaditumod.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/25570582541.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/bulemesixigazetovo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160751c62b4729---76274451728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=temperate-zone+pomology+physiology+and+culture+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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 17040 bytes
SHA-256: 5ae7d3bcfb40e7cdff0204904f02f2e0710bd30955982592634d076375f0ba8c
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 11336 bytes
SHA-256: 5e8834b7f16d34e8acf11f84363d05f64d17be3aa740f2fc6dc2d68795f22407
font_02_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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