Malicious PDF — malware analysis report

Static analysis result for SHA-256 692bbc808a089fd3…

MALICIOUS

PDF

106.6 KB Created: 2021-08-19 03:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4f09e18239fabe8d2d3df2f18e482707 SHA-1: 0414bb089e196b13798a1bf9857fa5e6feb86190 SHA-256: 692bbc808a089fd30e69b416e0c0b5139c881bac8ffc2cb595fd24e1a0c3dd4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/34056748991.pdf In PDF document text
    • https://akapacha.com/userfiles/file/bixaluribupi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jigujobevetuz.pdfIn PDF document text
    • https://alariel.be/userfiles/file/voridilowamonuki.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6150fc6442d24ee270b20cecd1adb12e/zavopesuduzukovobaw.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d625ebd75---91082178912.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/23756453943.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160edf04ae241d---zidomopajofolajifum.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/20474893568.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b29607f99---48216755524.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/16eaqe4os4hn1iia0sj6erl7f7/lixojosajin.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/19819c8f3d86254d38a00ccc7ce63514/muzozugelifaribabaganu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45633b86a---xijabitorosa.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/fipavote.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/db0b05043a35b619fae88c2dc2b7b520/patirulejesew.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20247448532.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ibtc7qkf7hq3gsiqaqth34nce2/jerepopeju.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/11796047220.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03a6a7178f58f2b011b167b134393c35/95129196835.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9a19f962600375fc5f97fa1306a3af7f/fimikafud.pdfIn PDF document text
    • http://rld-carbon.ru/file/gadatidisozaxovopexagewi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c5e20703aaba39600e163bf208735fc5/notafejemeleretalovisu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464b226e0f---12384001575.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/perexusawavejedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=surah+al+baqarah+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015fb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15FB2 31664 bytes
SHA-256: e23118ef46e07f65e111f46f27d62562cf12533d6d8fee89845772a24a5371f1
font_00_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16108 bytes
SHA-256: f894d9929e634b917f41492ca208a87775ba2770bb125243e90b5b4f355a456a
font_01_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 10652 bytes
SHA-256: 94226c3e7af8cc264d7f6b54d59aae990517a47892efb3e0ef98be8463b7aee7
font_02_sfnt_off000147a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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