Malicious PDF — malware analysis report

Static analysis result for SHA-256 227e77a3055bd5d5…

MALICIOUS

PDF

105.8 KB Created: 2021-08-12 13:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32d85fc3cdd9ebc8036aab9dd95f4e1c SHA-1: adde00fa7ecfe0e3be2bbf9e3b366b4f42d4ca9f SHA-256: 227e77a3055bd5d560ea9e9e47d3fe411c875c4f511990defb890a173f83b4d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://fujavietnam.com/images/Download/zalixirapim.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f543f774dc---20694629904.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf04499fa---fidonefebusus.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jugovevesa.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/de1e91728c04b2d4a72140a298c60514/17670877302.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4320c7976---95720853245.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/19268166421.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/32746107363.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16225533791806183898.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6ade03679---gazetuwovenopu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lvgtlr14jrlk1gkumkp82ph6gb/dofujovemefoluxiketi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2a53992---68065899952.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/93451980988.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d6a2dff1---vixitez.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/5338990560.pdfIn PDF document text
    • http://domainecomps.com/documents/files/nakoj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfbda670e---60588779264.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0d157085---gunukunositavitil.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/38016708580.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/29d122f476e5db50848f3fec80344b7e/31864322956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=la+proposition+subordonn%C3%A9e+conjonctive+compl%C3%A9tive+exercices+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 22148 bytes
SHA-256: ecca000575ae33ed51c1ef71eacf826d86c40aed285312e1a5d7b506b9ac38fc
font_02_sfnt_off0001652b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652B 11428 bytes
SHA-256: 964e81c14c840070b95800aab71f6d78dc49d3f6e2bbfd221167f0b95b1c981c
font_03_sfnt_off00017f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F9B 16240 bytes
SHA-256: 600e0170201a71e7eee8311b3cb6bb56ed1cb92e88d24c4ee7806e8640a9b48d

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