Malicious PDF — malware analysis report

Static analysis result for SHA-256 2505e6b16cfa871d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28d300e9c45c8f37a6d4abc97956cae0 SHA-1: 7b402237dec5e3b323533c026eb1d073807e8a8a SHA-256: 2505e6b16cfa871d836367387703f5cee7d91c6cc86723d69d7c541c524328f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics related to link farms and compromised hosting. The embedded JavaScript and numerous URLs, including one pointing to a compromised WordPress upload directory, suggest an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=cancer+is+not+a+disease+pdf PDF link annotation
    • http://tottazo.com/userfiles/file/kepilotukagabesovud.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/44870416366.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/27764382919.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xosonobaj.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/zirepizovaxomovaga.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/598995661.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f101lmm6mreijb3il2pss07n76/11210222412.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49199937810.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/59609193075.pdfIn PDF document text
    • http://freestyler.cz/img/file/58869492960.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/tekuvimamatuposezitipob.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf54c99bc---82518594063.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/xiligitunovovuzujareb.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/kamozonozebefedorubakumuw.pdfIn PDF document text
    • http://word.mn/uploads/assets/gamos.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/xajuwomeviriwurudifunejik.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/afc034ee09283e553c43a3fc75ca8278/35924290140.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/13865665076.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/ronodipupukakirip.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xubaxavebakotekafal.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bejofuvarowarejelemu.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/79406692689.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/vafuxalewusuni.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/fedamovuvukowuwiv.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/tibemufifudusivusom.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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 15664 bytes
SHA-256: bed9f11edb6823190e18f49a88a438e54a8c8bdb8ad9ba9571ab13e8a7bf6faf
font_02_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10596 bytes
SHA-256: 5c128674fd0b19da2454a04784c8fc4424fe8590cf9922ecb793c4beb9cf0367