Malicious PDF — malware analysis report

Static analysis result for SHA-256 58647e194d5f8c00…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 09:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e0d7c4392aa77d3562a59e87c42361c SHA-1: c155d200ab994f2678c798d8d09105479fc8b05b SHA-256: 58647e194d5f8c0089e2f8dd1e504c49e8e064cc3e5f2e7f8a864b34c783e5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mitsubishilongbien.vn/images/ckeditor/files/nubajipokemuponowewexumi.pdf In PDF document text
    • http://vkp.ru/upload/global/file/kadepumakogin.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/2323899394.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/5682544708.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/84345068180.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613983da593a5---22609386072.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1919978fd7f522c82cd0fb6dfcf435e6/19625693226.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/19382739403.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/xapikizubanapategikijiro.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44693881800.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21821778383.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/nujufelebibirafutowi.pdfIn PDF document text
    • https://aayams.com/userfiles/file/54015040392.pdfIn PDF document text
    • https://pixel.bg/img/file/puvapixikemawofuwekifane.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/17737309802.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/60353547133.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613442a52b1d5---8374088097.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/venopudexulupivatu.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/36982859045.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/tafemok.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/51487738366.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8da592f0842a867e5893647921950db2/63569956334.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/41859979894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=index+of+shameless+season+9PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/vuwowomuwodoluguxategoj.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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 10548 bytes
SHA-256: 3a49d59a23a08d7fb0d4abba4b5f8e43fff23a313a797102bb802b73652aaf0b
font_01_sfnt_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 15976 bytes
SHA-256: 9f2f25e1c4ce4d7071c540fffd09689f75d7a2e8bd61a13ef48d3d2350790eaa
font_02_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1