Malicious PDF — malware analysis report

Static analysis result for SHA-256 c582afe7d1bb10ae…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 22:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ce93c79dcf1dc45a6b49d60e9885c63 SHA-1: 003abac0d94a6d623a9a6084d539e8893b7b7eb6 SHA-256: c582afe7d1bb10ae67b71b98d4e75eb76f60c1643d6a34c414fd2d603e6c0c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to exploit user trust and direct them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://woodbridgeabw.com/uploads/files/97522563684.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/50a64f0045c03f7c47651cdfd8c16f0c/zakitagoradu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/85483993006.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/5954863538.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161385d93c20de---sedanasinogaja.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/kapixiribubesoxagim.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/366443abd077dd35d65b2b94f12c055a/58184649621.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jofigedu.pdfIn PDF document text
    • http://c-amc.com/upload/files/83077698004.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebe8e36c73---83218108369.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/14380707907.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/49b693dc7e342ae2f999148835e7d618/sekur.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/faladunupitoram.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/xafotas.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a049eae034---xagetigusamedidimer.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300323befd3---2084647788.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/nagixusobuv.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tuzit.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/13312534439.pdfIn PDF document text
    • https://southafricapools.com/contents/files/13107971792.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/petelogevimezovul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=conducta+adaptativa+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_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 19344 bytes
SHA-256: 3889c70b259351796a9272b79a6e619e9ad8c9e8211c15e865d22c41dd3f0fa3
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10364 bytes
SHA-256: 5f73bd3114484ae36da66432ce8dfeff8197528672f5b68e404325cf3417460b
font_02_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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