Malicious PDF — malware analysis report

Static analysis result for SHA-256 278907116b2d1e3d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-07 19:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c913f84f27d7de9eb6bf5caa082a366 SHA-1: d48092a1a6adfc0913e6e222628f17de1d2b543e SHA-256: 278907116b2d1e3dbf9a9a91cd9c85076410deaa1337fa4c76ca3c38e85ed8b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d0d2806c337ccc023ceea7105211fc3/retuwizino.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k194cpmn8tpuc5s9opmeu6djc9/ladosogerekoziju.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608111cadf5ff---lotaxewavu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca04eac59---wimobebevidovoge.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4bcff81516db1dd0f66e5bab70466ba3/fujamabijafuwosizozu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/eprgvjdksivueg9h80cggt53h2/76905941226.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c73890a8c1a2fcd960c689f726c94982/vuzavura.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b781bf0723204bb5df1cff5398839f07/67963742712.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/72829399625.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5ckedk010alfd4qmrrt5fsiqbl/96762534260.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tidoxeneji.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s9cjsv68lhivvr6i4kk4o5kv2s/23143811202.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3qjb5pnes63fv4etgd3nuqldu9/tawenizijetobavadogiwo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab2babf2c---29015417569.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/wemixadivugejujalig.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jujigisuwurikupokedipu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160814d3b17e6f---28629807074.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76a38c8d6850d5bd05f6ca594552cd82/32940364746.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/denuvoxuwixi.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/zajikijugapiv.pdfIn PDF document text
    • https://gangnampools.com/contents//files/wurotesumesuwiboziburu.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/dupuvapemobigokexe.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/nipub.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/34292685841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=are+peaches+good+for+weight+lossPDF 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_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10864 bytes
SHA-256: bf670f7635574b210e826c55287421c576d02bc27349d7976d9c7a0d569be118
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16404 bytes
SHA-256: 7b4ee354cb6eecceeaf9042bb8456037b2160a73d0cddf4fa21e0fec8f67d27b
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1