Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fa6a2f0d1c83de…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 18:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c5a9ddbf733e06b8a5d3ca79fd71c58 SHA-1: e0b63a835429ad9a8aef6cb3d60135b381af104a SHA-256: 12fa6a2f0d1c83de1248fe728d801309c4abb05e32488f465f6168ac9741a66a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggests a phishing or malware distribution scheme. The document likely attempts to exploit users by presenting a lure that redirects them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bdbb7d86e593436bc6b12f7c722effcd/93545957624.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/960cb632f782ce257553f2e450683ed2/88580338918.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/375c965a2e0d9ee94c0861bd5150fcf0/xaguvusubitovovifuwelo.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/om8q002fr8ml88rmj0ui4pfuca/reduneromisubugasin.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/sunovefokuva.pdf
    • http://birnagarcollege.in/userfiles/file/salujunutiruwuso.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1730323---tefuxemigoziletukif.pdf
    • http://broadgatecapital.com/userfiles/file/porige.pdf
    • https://wegofa.com/userfiles/file/23584555534.pdf
    • http://aarogyamedico.com/userfiles/file/14733930502.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/pezuzomewusozozipimabile.pdf
    • http://eakqshop.com/ckfinder/images_store/files/3102540228.pdf
    • http://banlinhkienlaptop.com/userfiles/file/purokekopefobakakafiwu.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2b8b9be9080b8053e3bb446740660bd2/zulilusapupafanoneb.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mh81mk6ce5jlbmj43f866t0s11/nuwubodetepupazibuf.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c0f1d65c8---pikubofolubipomosadalome.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c83cca450---60638065455.pdf
    • http://www.tsahimmongol.com/uploads/images/files/18290316963.pdf
    • http://janandpoos.com/clients/872640/File/91531481233.pdf
    • http://soles2walk.cz/data/file/80255686082.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203381dc13---41002317077.pdf
    • http://jjinline.org/file_upload/file/tarazezopu.pdf
    • http://henri-ruch.ch/doc_pub/file/86297359066.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/ninigorerari.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cpp+tutorial+tutorialspoint+pdf
    • 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_off0000f31e.bin
50260a05042a121690fb34c25d56101d6f830a47cb12b62103fbfbd88dd5ba85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10488 bytes
font_01_sfnt_off00010b0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16792 bytes
font_02_sfnt_off0001231e.bin
5cade9bc1d6e3166f6bc808586c3a882c190ab6b29f4c47315ff3445d5b6ff6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 20520 bytes