Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c9845ef3fa6730…

MALICIOUS

PDF

103.6 KB Created: 2021-06-27 12:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f0814d1ed0ef59b9ef8f1588399c309 SHA-1: da938ba8c2aeb0dece058d9a4ed50b8597bbcfcd SHA-256: b3c9845ef3fa6730f859bf9de13587b915626a429a48fef7f05be1e6d66ae1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit user interaction via malicious links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akinmedical.com/uploads/file/gasot.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1db22c40---romavugotofid.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b79f3205---88655842028.pdf
    • http://vagtteam.dk/userfiles/Files/13491564552.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190db1e332---kopemunejivutopiwurepixex.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/visq7ar3tum5jl8r7kesmcihr0/59456324771.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f9f52fbe28064b6bc97d24ca5e37dbe7/80223899255.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673c00f00---45849047123.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/52181a0b926b632f443211df41608227/53369377807.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9f92c89e---gedowevewasaguvasosoki.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8aepdqd954om1kej888os89pq4/kumikipalerukozepiz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e0c01cf3---79143575066.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4694b260b6bd056a0146459b46cb8ad4/75175416619.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/80656249170.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b94d5cc7de41803a11e36aaf55d51408/vajawekosaresijesopifaz.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab279ec9033---dojuki.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/nafupab.pdf
    • https://securityguardsupply.org/php/uploads/file/nuzadujokoborojob.pdf
    • http://kppzp.pl/userfiles/file/vegonaxilitajuraxuxe.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/edefe7f2762a5769ef50cb752ce4a8d0/pozalemuveletutub.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac120172380---74986819940.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fb1961ba2158d813aaffdec2bde6ee83/52503639870.pdf
    • http://absolutelyneon.com/userfiles/file/48018987171.pdf
    • https://yingzhaoliuart.com/upload/file/97396250389.pdf
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/sodawotagenoxafejur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+richest+man+in+babylon+chapter+1+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
font_01_sfnt_off00014101.bin
f8cff8f929cf630827a0fe8cd860ed2058aef816477eb10547b919396034ca2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14101 11008 bytes
font_02_sfnt_off00015a47.bin
be2f1978b2d23e5103c13a7a9441865d22ec90757262febd1f6903270c1afcf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A47 20700 bytes

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