Malicious PDF — malware analysis report

Static analysis result for SHA-256 6491d21aa549c0bd…

MALICIOUS

PDF

125.3 KB Created: 2021-09-04 11:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77839846f0f99b2695416b7853139cac SHA-1: d1fec5f66e2494e4e858fd14e018ac05467b4569 SHA-256: 6491d21aa549c0bdb6aa2bb097c86317549625684366195b1f0619efb3e7f2eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised websites or potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mdsalon.ru/img/lib/file/60966474340.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/batoxuboragowolik.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/xawojesagixogerexivobe.pdfIn PDF document text
    • http://usateatop.com/_upload/files/dulagexubuvodez.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9148360863.pdfIn PDF document text
    • https://btegypt.comfile/73468058355.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b60146559---gimerives.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/jexilifokufus.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/65169430924.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16281244678213.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/4qg69a17cg2g8kkcm5netogadq/mexasubibasoz.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/27958170276.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfd6da889---sopedajovotuxoxuba.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dsm6iovia5olna7rvqe5g6tnro/kubepabe.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vosakolilelupefovo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609064764b49f---39594085775.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/37379738918.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/viboboxis.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa37de58e2---kufefo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a2dfa6d4c---kadomabosorepezejoketalo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/fufewubosopokibekobulu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/98991880665.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c01b8ae8302---64342937580.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/47748171394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=edital+concurso+receita+federal+2017+pdfPDF 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_off00018094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A6 20048 bytes
SHA-256: 9541e44d192d78ace68054a0a189668f1820209d2380f04db82bad022f04126e
font_02_sfnt_off0001cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD4A 11040 bytes
SHA-256: 45f7bd0d58990b07ced31ab4a75c5f073302a18f65fa3055a154610b74dc4f1f

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