Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7d635d61ec445f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 07:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d38918741ab45c33d7b0d2b8ba9a5242 SHA-1: 7f2b1fc113a2e07757da133ae1a647273ed0c26a SHA-256: ed7d635d61ec445fe1ec58fb1f9bf4f24ebe1a45d40cb625d57e9efd1b0571a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://coretry.ru/uplcv?utm_term=gta+v+money+phone+number PDF link annotation
    • http://whatcanidoforyou.eu/publish/file/68315819404.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109071030029775.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/2977278173.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/disomitosoko.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/21642396443.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/67496090427.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/1161423052.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/59195306403.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/titejafepop.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/valajodote.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161376c94a90ca---bodavi.pdfIn PDF document text
    • http://napiarsaigh.com/images/xujawi.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/baxokefibos.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zukofivefetoxakukenajifo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ut7k38e0ruopf2adh5oai0h592/neduwewagugidimuresuxur.pdfIn PDF document text
    • http://pmke.cz/pictures/files/36906452690.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ja48vkcl86ri81hhq94s6j87k2/fitaguvejovakosi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/tupasowo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/49406389882.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lagerilimisevepojazofu.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/58043695997.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/81ef80b847976e55398cab101e7d7e8e/furazowagebafumunimotuxi.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/kurugorip.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/vifovegilutabogemijo.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/zowabob.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/warigid.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/30416326510.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16632 bytes
SHA-256: f84e109070e710ad30c54d89bd04258f7b671ea2b0217a42d9b548e02a2b5c98
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10672 bytes
SHA-256: 74c7ed49583e604e40b7e8aaeb935334d20bdf83731f2ee2cc1c96066c2b0191

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