Malicious PDF — malware analysis report

Static analysis result for SHA-256 23193fea7e4c7548…

MALICIOUS

PDF

93.8 KB Created: 2021-08-11 20:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d797e2ed4c778e984c264edefc340a40 SHA-1: 0e22165089c2c93a7133f7277d2126ed9b37b837 SHA-256: 23193fea7e4c7548900161ec35325db455c97eade58b1297cf5f89c8e0ea4800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • 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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nogebunuja.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2c386c27b2a605827f506f6e67cec303/22312397712.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/xawupasupime.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/40418446773.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/dukibogorebuwixenavavo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7da5ee84b---mazazigixunalevonazulo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e07a193fc---tujodelegidelevo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5gqjajsa6l88vkdc3v5k625vl1/89150097577.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/27034160748.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/89877065478.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160703c3b1912c---pupifi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086126d74902---gojusowab.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/9433573591.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/puxunizugusu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/genozitofofoto.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/bakubamuzusulugamuworegi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/05f1d4e0e07e28aa9c99d0d908fec72a/vifalewa.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f2f33f088a8892a915e0eab526cebeb7/39375705364.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/mufejomuwepujunasa.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/sutazugejijawesovikimi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/05c1cd51d94be9288d4cd778a14febed/zidizizunitu.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/2846856482.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/regugufedumomis.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nikati.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0a3e32941d0d84b1184500e82d309862/libezuxugaleguxokob.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/39b40df74aa66a704980fe84cf3258a5/wiwuboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+carbs+in+a+homemade+banana+muffinPDF 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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 11028 bytes
SHA-256: a171c5589e358ecfae1db280bb5b6f6612abe3eb00c6c2870faa17d10ad33af6
font_01_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 18128 bytes
SHA-256: ff511035fd31c3b5e9d70d08b10d1b2f4e9ab0e995affdcae33db530e78ab83e
font_02_sfnt_off0001512e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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