Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a143f7166b2056…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 04:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6970ea12435685bbff4ce91d30206fa SHA-1: c725e98400d7cdf2980db520c8d6bf905ef90522 SHA-256: 89a143f7166b20566c2756a8870281ec7e8136b5e92f9dbb1bb5b4c11f9a4a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many hosted on suspicious or compromised domains, strongly indicates a phishing or malicious redirection campaign. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agcslohian.com/userfiles/file/54557831521.pdf In PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wagozirejulij.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8kn3i7c4rokj6pirl29l5bfa0o/godoxawite.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/divagufatavazixapovuxuna.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/92571474048.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/18238747537.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/65831761424.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/marixudozumifiworubemik.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413b571dd9---mozoxe.pdfIn PDF document text
    • http://rafaelokazakov.com/file/30628701152.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/maburoximebojagagof.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905070815284004elduwevkl6wk.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/91550345739.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/96642641280.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325d24c929b---gulofevikeg.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eaa675a55---73240055804.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e734dd2471---17823179371.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/41993697864.pdfIn PDF document text
    • https://emenu.hu/editor_up/37849219404.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/35305181489.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/tedesubu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/41114656354.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210925013206.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/37934321372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=serious+daring+lisa+roney+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 18344 bytes
SHA-256: a82b4454b93ad4a283facc75a129d6e81ed0c3e29ffa0eda27c89000bb56f258
font_02_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10864 bytes
SHA-256: f926612cc6bf4f3d578ecdd3e0f8bf4fd9a2dfe7eb4ee14a6f9afa5ddb272758