Malicious PDF — malware analysis report

Static analysis result for SHA-256 7989e4f327d8b731…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 18:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4d0e4076b93052bd1f5c5bd824738b0c SHA-1: a413242abbe23a1b9b72b61374146dc5f2290183 SHA-256: 7989e4f327d8b7312ef8b5be17d2e5acf38ad2b2189c21a26446c56528cff27c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=puritan+laws+and+character+assessment+answers PDF link annotation
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afe95c46d---kokogegaxizezulodi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160800669b599f---ruxutuwujav.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tuwuvomuvovesolasanag.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d4699b69195---19178539373.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/17831573957.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d28fdb8f3b7fdc3b2d0fead247bcb7d1/88754235324.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/45a3cf213b94b5f1b4911c988d95941a/tepedasanavota.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vptcs0cepkbs2t0anvfs8mshsi/mulusuvodexogiku.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a45a37ad45708185132fabccd335894b/mafatusuwokisidoju.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/fixexevogerupazaxufaba.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/a3342g28r0jij6tmsjq38t6vj3/65283300526.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/79341239655.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee44aa463---83865913841.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca5d47825---dezuwomom.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/damavekaju.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nr4g50a4iijim65bfr0k42rp3/kamuwowobatebusila.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6cdb43d0---zanokukapiranubadowabati.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a76071b4---37312672306.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kifobami.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/19222785950.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/80250172427.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_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10700 bytes
SHA-256: 2f9fc24042670c98bbd6e5a94c3cc0adb0c4e0ed1b5cf9247efa26af011484fa
font_01_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 17364 bytes
SHA-256: 89e166ab270e53c267b28d807d1eb563d2025028bd2129b9904a48fe882a554f
font_02_sfnt_off00015896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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