Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d264fb43ed4abb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 05:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b74256918d0350c93c8e28992d94b9fc SHA-1: dd4203d408b4e227405c2f30dae65d836fb2291a SHA-256: b8d264fb43ed4abbeb418e1e43cd4e665b197650028511aab5d6a581f3c5e09e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://ketchas.ru/uplcv?utm_term=screen+share+firestick+iphone PDF link annotation
    • https://darshanam.com/ckfinder/userfiles/files/50970738456.pdfIn PDF document text
    • https://diphong.com/uploads/wivoxeguduxem.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/77548013740.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614285d6d5008---93118349515.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/2095771723.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/matedamel.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/37048019942.pdfIn PDF document text
    • http://zkpower.net/upload/files/torowugumufofuzif.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/97059607625.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6526409071126b1090518f6ac8bc875/3237041728.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c5ee20b9---vonanujenuxivutuvow.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52458415753.pdfIn PDF document text
    • https://emenu.hu/editor_up/govet.pdfIn PDF document text
    • https://activepymes.com/pub/file/11618334131.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e554007ce3---mofovawepomeluduxamuvek.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/raraleseputasubo.pdfIn PDF document text
    • http://headrepublic.pl/images/files/kawonopame.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907143042.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bufajog.pdfIn PDF document text
    • https://trexanh.net/upload/files/17367092147.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/22611197532.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_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 10700 bytes
SHA-256: ffa9154a51e2eaacb3b78d39ed48bd3624652861c4ba440ef4db037abce37c3b
font_01_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 17824 bytes
SHA-256: 10a6acbdbf429f1f237078655394212d2b53ec60a0dfda43c0aa347fe84bd05b