Malicious PDF — malware analysis report

Static analysis result for SHA-256 488d411557939473…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89cbac2baa7191bdfa1fd2e2edf89a3f SHA-1: 733bf73389e1990a3a7f90f8f727958222fa4b19 SHA-256: 488d411557939473edbdbe9c452a5708517a8811de70dadf7b5ce7a9422a4429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://maketmaster.ru/admin/ckfinder/userfiles/files/mupibera.pdf In PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/6342804170.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133adc5acd7d---degiwefimidugebojubakota.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4f0158ace0f0e05294956ad3d8b1c26e/36047351955.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/rizalozetujebo.pdfIn PDF document text
    • https://sanidom.pl/img/file/73740118729.pdfIn PDF document text
    • http://pk.mo/userfiles/file/39117658067.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8e43r97hem177v6rk0di02cim9/1663017036.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53981ee28---sisifitaxulejo.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/96788640591.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gisasinujifoduzobubejat.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/mopata.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316dca4b268---63697625984.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c73bd9095---rudegubikefemoresole.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/36348158274.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lakixopepidutiputixawijon.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/34673824269.pdfIn PDF document text
    • http://ave-france.com/pics/files/29216691135.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/mipowosanamoxef.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/505d65587e9c4be38527a823224ee45e/77697652263.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vufeximomor.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ac77c9bb---80361415445.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/losamukufenekidizojiziku.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/1987632803.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nilajapaxozi.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/5000233877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cube+cylinder+pyramidPDF 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10676 bytes
SHA-256: 73b48469878457c02f8b1922fc849f2039fc05eac508973fe0b796b56360c494
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 16948 bytes
SHA-256: 928f5be02cc0d1ea0799ca48eb886f737f088c4896214814a70b05dbc5150db7