Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af33b53ae7c9f18…

MALICIOUS

PDF

98.1 KB Created: 2021-07-05 12:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dd69eb45069058632c6be5947921e0f SHA-1: 1601848ce2c76a584a8afd53a7bfcfe880e7c364 SHA-256: 9af33b53ae7c9f184034432ea4cd225402ab5b05ed1a3eec9bdd332dfb8804f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://krisoc.ru/uplcv?utm_term=invasion+of+the+snatchers PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5dd82dfc---pugulelevugevorenikekif.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca5a658b---lisovuvajuxaw.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/veluninamebejeno.pdfIn PDF document text
    • http://www.celso.org/download/69170199909.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tukigolojujer.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9824c593dd---kojute.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344ad17f5e---pajowobosamedexore.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/pokodufuparejuju.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/54865018139.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862df5d6e5d---87014186732.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078e59cebea8---fuxowetuli.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1a12b3b0f---kokugukubo.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/tmpcq5viot62mto9n643at33f1/fopexijumalujuloxafugez.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zekomezibavalukawi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b34c3c4eabd0ef6b02c5951585b8b1a9/98286881720.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/80e8b0c471baf34ea14b28fea88d00b7/kuxet.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b310e2e9e90818d080ba5f677f18a03f/zapizodefuz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6qlgvcv3qhkv56bqujccjanr62/27760683178.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48daa3f42f---84682920990.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/tutixufarejapofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb63eceed---vexisorumoro.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93331672293.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/xozawawisefalekorelupud.pdfIn PDF document text
    • 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_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 18216 bytes
SHA-256: 0540d8d1d095d0614b99241c52909620cd080584f58edef54e5de49d1e3d1b63
font_01_sfnt_off00014bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C2 10404 bytes
SHA-256: 38bfa62679b5a963094148b49f1790738087f60a559342ae53345f17137f1604

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