Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f7a80514b959c3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 07:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5308eb6c30925a65087225f1b01b7c43 SHA-1: a6b53d4e6fe655bce7a7fefdb33917c41aa6cf34 SHA-256: 56f7a80514b959c3d4a18b17580760cbbd1ff9362181f2650a1b8394b4d3bf76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://parc-hotel.info/file/puvekebimomi.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/68238658149.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/wajiguler.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/revidivazavu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392efb1a4a1---86559156474.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24274778479.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/57347306845.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/77939848986.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7969534868.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/376aa6965913b44256b9ae7a87974bf2/70367701967.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/belulodunibene.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ruratulogi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/depafagipelex.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0cbf438501a21e4e32665189f37aea8/sepanubotizozaruv.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/24212106682.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/81585742502.pdfIn PDF document text
    • https://pixel.bg/img/file/57960528356.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/20703741345.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xafiwokakenubufaja.pdfIn PDF document text
    • http://erpos.sk/data/files/94869936797.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/44039701184.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/63225711499.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a8eafbc---51780022078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=emulador+android+noxPDF 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_off0000c0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 21324 bytes
SHA-256: 21b8727c86139f9c9fc049f41d82b9233fa4353a803b6af69e4a212384708eac
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10196 bytes
SHA-256: 9022afa533f8b0b25dcf5068ad1c806225e009de9338a4ecdf8dea07eb677d5f
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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