Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0c6e3e1ce1e569…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 15:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31318ddfdab483f279f5f73f32be14e9 SHA-1: fd545767c753a17f7107ae7a62fb64783be754e2 SHA-256: 0b0c6e3e1ce1e569eb9df392b49e8a5fd792ae05f8c60c4d8f06c8acb77814eb
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and links to multiple compromised WordPress sites, indicating an attempt to deliver a malicious payload. The presence of a download button further supports a phishing or social engineering lure. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0fce71974---81867479124.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c502ec74bab---33436013976.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8781f3037133d925360c444b707d6e4a/zananinusalorewalusopeku.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a56a11491---farujalizanetip.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/zupulazojikekelunup.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zulenurobek.pdfIn PDF document text
    • https://33mobility.net/uploads/files/75579276607.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/fukijalu.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/77506267025.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ca487a45984---29386576909.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/46591333933.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/63452066726.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/88363650616.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b674f457---90740339100.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/xujuwazexepexujur.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/71999103320.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/tozovozop.pdfIn PDF document text
    • http://piecco.eu/upload/files/lagam.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/niguzujub.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/467837616611a6d6647594.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/80341752071.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9hg6mk9el0i1o7je721r8peo42/kadixerob.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/lazibabedodew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b57a62292---79634847240.pdfIn PDF document text
    • http://hydrem.ru/images/file/pexedafo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jojevubofodogusopojen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=finding+volume+and+surface+area+worksheetPDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 11244 bytes
SHA-256: 9a90d6be9bedbaf660672a767662f48bac14d3401beb2cb99af5a0c87b6f1da0
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 18292 bytes
SHA-256: df053ebe0a902931b4d8f550b9117c0a977d0933278c25128ab2673d561a58b0

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