Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc328e61be657b9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 20:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd4a406e3199798e712fa8a858907086 SHA-1: e86d13c552aef5423bacbec03dd46b25b0c7f575 SHA-256: 1cc328e61be657b9e211fe65119c130f64da0cae2faa9b2c9d9e74f743cff4fb
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 delivering malicious content. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://chiengthai.com/file_media/file_image/file/81710098149.pdf In PDF document text
    • https://cargotavio.ru/files/file/xekozewoxijafovupiwegudun.pdfIn PDF document text
    • https://melz-feu.ru/upload/jejosasux.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ec82de20---zivosolenevititonen.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2f1323ae2a8781ca29f4c3af146219c3/71725848562.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoledopufaner.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/56805234383.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/86125674870.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/408dd63fa66967234172a50091932df6/36004779757.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2742b836---3506884966.pdfIn PDF document text
    • http://schturman.ru/files/files/39413337627.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/67023211016.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096282dc0d79---silitonaxa.pdfIn PDF document text
    • https://argumentua.com/i/file/67840547587.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d6719517---40499982152.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/29556561110.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/vojogamotazatiwudiboguji.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/86027245343.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/83566977758.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609601bb6a19b---renejigulelanex.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/86499639234.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/91922677115.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/17eba6d5d7929e33294236e731524045/rizizotipitemufelajev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ferrous+and+nonferrous+metals+pdf+downloadPDF 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_off0000b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 15996 bytes
SHA-256: 014eb9b7e3c25266244cf9e2e7850d367575d1795408470d3b400a982032b5b7
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10728 bytes
SHA-256: 29bf1f32b9781753fe30ae0f718b415888ec8ae5ffec3aedd90d047a088e0101

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