Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac884c1e40fd77f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 23:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9e9c616a9e83a650a5e24aa9d4eae09 SHA-1: e2cb650e7209ba28e479ef51fb9c9d15ff16d24e SHA-256: eac884c1e40fd77fae7483bd5aa6bba79adaf9c6c921c6093395d93c28c635bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://adriennemason.com/assets/files/forizefijozopax.pdf In PDF document text
    • https://doina.md/fckeditorfiles/file/jaboridivo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/eik5h8a7pvub3mnnnqi172tkeh/solojeronuzejufop.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/21638095453.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/35131250002.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/gifofutuvibobisovog.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85776787310.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/622ae64dbae100b5ccf875fc1a32555d/44474442006.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/zemeneperim.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/85625255296.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/riwaxexefudifixa.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/makonunu.pdfIn PDF document text
    • http://qdjshg.com/files/file/rumawobedezexopu.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/7885268538.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/67999352862.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/226fd3.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/57342075923.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pefegisimemuwozarede.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/5014146825.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1278b3c04124d1ae1e7e3b204c386cb7/rofuzulepofojavojejav.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/80150657378.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/def0d082b98ffeaafeadc06cd4e0073a/43312783100.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/pelagozugomalu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/9627115235.pdfIn PDF document text
    • http://med-os.com/user_upload/file/witedoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=omegle+other+person+camera+not+loadingPDF 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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 10988 bytes
SHA-256: c1a1d379dec9a55e65f68137ba11e0b460d1be6e4de1c1efc60eb75f57518ea2
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17784 bytes
SHA-256: cd80eec40c2c5d89d3091bf7c2e7b6baab110c9fb1aeb7492bab23f539b53842