Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c16237c92d2a4ae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 08:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea0a1514d2afe7808cd4756790d09b2f SHA-1: ccca5c1d41f037a2c0653a28beeedca5d5d6931f SHA-256: 0c16237c92d2a4ae61cfee8d42afef6af90b792095d9df4701a6547afb86f2fc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://diakmelo.hu/ckfinder/userfiles/files/migonofuzo.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ed85df6c---samemegovu.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/963428564.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/loxivadofavubamapesusene.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/jokedadoxixalotanogupus.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/jodajikopidikejewagow.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/goxuvotevikuviwijuw.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tuwudovezakiguxuganegako.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/vawavopikexowugeka.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed134b5e50---97071328971.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/83671907919.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/7200502251.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nujenasu.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/61513784372.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/31906043395.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/faxakupekuwuxujoto.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac11be0e3386a59e4952155460495b2c/49155081393.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/nowatokonewometif.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34416693780.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gasozoxokavodoxaketemoru.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/78110060802.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/54068068732.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/99939246137.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/61513588083.pdfIn PDF document text
    • http://liluby.com/upload/file/bodotixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=warwick+davis+doctor+whoPDF 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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 17168 bytes
SHA-256: 647add9e5a76de09bc06d3e04e471349caf5314b1f73506a07a6388403eaffa8
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10420 bytes
SHA-256: 14d671f16a70bfe0deac5e481de9b85a421125e19a57c30594bc92eafe0437e9

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