Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ced9bf0b610c8c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 16:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1b22de8136410be73b5ee91c2109cbc SHA-1: 67756e7a9e6876f240696e29ca404b36f11390f1 SHA-256: f5ced9bf0b610c8c5412d8bfff99e09f2e0f84d2108c749d93b239aa0bad0703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ba67fee3---62611791627.pdf In PDF document text
    • https://okazionche.com/files/48376460932.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/kenevadawosa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fasajagolijajaridetibidu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819db2c245---50813377340.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d415f138e9---jiwudonujijifedem.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jotenekumemukim.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/bofetujuxosumidaromow.pdfIn PDF document text
    • https://tempegaring.com/contents//files/28666988406.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc163bb9b1---17849197574.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6e5e3620770a353696c01b1e35011990/38932995164.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8096279b1---giboponuvap.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/56834959418.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/20077223092.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19076265788.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/1168925956.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ba9t7aesshfbgrnfiia7i1nr56/wosanimuliduwer.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f24e9c650f96c63866858c02470f2f47/99220721527.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8246215644.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/imh3ftcftqftmoadpr57dd2c63/moragupodokawifukodu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/genikazutegakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bugzilla+testing+tool+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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 18340 bytes
SHA-256: 87aee6be6779844a5e158ed9fbe85be5b644df400f2c5ad302a280bfc98fbc69
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10784 bytes
SHA-256: 218c1a7a586b9b2f65b8bd5dc0cac9ec374675c85faa08db65ae68266eaf7084
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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