Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cffbc865717ff2e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b2ada900683a7b9cf9b15015b78b87a SHA-1: ecffa89e847a308f561027ab3822a5d8ee71abc9 SHA-256: 6cffbc865717ff2e1fbde1339220fd293e4f2129b4491da7a149553107844f8d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm on compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a21404bbc5432dfa96800472780479a3/85583243942.pdf In PDF document text
    • http://uitetenindex.nl/images/uploads/ximuxikaxifonoge.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/83597085643.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/82595299867.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/vepakisodapupizuxod.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/70502898795.pdfIn PDF document text
    • https://olterus.com/contents/files/55352683718.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/99583108637.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/zovun.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/ximuguratafitesufevabu.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/kosotupatezerizabiki.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/39436138705.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/4652078075.pdfIn PDF document text
    • https://csn-alliance.com/data/files/96576745125.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/48714050404.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b661c3e0fa---welus.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aed9883d0---98252693800.pdfIn PDF document text
    • https://expomediainc.com/upload/file/xugiluniderosaturisa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v62bsd7b86p96bg2dm7uqfq4sm/99509684895.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/daxunixunisibesel.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/82728851227.pdfIn PDF document text
    • http://dfanchem.com/upload/files/lokomutijirewi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614778001f584---48847667213.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/xafobizilifojudojiredopak.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nerogeduwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=link+phone+with+pcPDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 18780 bytes
SHA-256: b3f6e8f5508aac03d0dd41f207ae40df25e6e1a60192d18a339ee876e6349edf
font_01_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 10128 bytes
SHA-256: f47b8ad460c0154528e78f5467f62c93d0b95c27568e16e0d6cd3f3304a49f0c

Open this report in the interactive analyzer, or submit your own file for analysis.