Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7ba3a3f6f26667…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 03:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 262576f5c4e31f566f0dbdb7bd6ce026 SHA-1: 38086eb1e2674243fde317d0127dc4221401c079 SHA-256: 5d7ba3a3f6f26667b8460c55b65042c66e789ab788a785d3f4f2d1cb315fb65f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to obfuscate the true destination. The presence of embedded JavaScript further supports malicious activity, likely for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=kiran+publication+ibps+clerk+books+pdf PDF link annotation
    • http://marcth.pl/media/fck/file/dalegetimifere.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/wigezi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/12976126736.pdfIn PDF document text
    • http://samtekelektrik.com/files/77221585923.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/70271816180.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cb7f4f399---gewujesap.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/15235116883.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/11198529154.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/72651467234.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/90043973212.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/podis.pdfIn PDF document text
    • http://hongdacable.com/d/files/dixuvowijazenik.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e7e26b076---korozosati.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j489ebbrhlon0atrqed9i02r36/95578663971.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609db8384c606---xalizuzewurubatinodil.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b5c585a4236baf73c7d3ac3e0926ea9f/bumugepixokafo.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wenuzatujenexufalineluxu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95964bce3e---37736493367.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xinodemobezudibotulifazi.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/55940074399.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9521f9c5---36161279354.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdfIn PDF document text
    • https://tckontrola.hr/files/93958798389.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098408388c44---81647603467.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zonepagukuwipokuzaz.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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 20408 bytes
SHA-256: 00e44ccda2e519ba9fff5ec4df62f14989925d5520c4169def1b3db8552bf5f5
font_02_sfnt_off00012ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 10936 bytes
SHA-256: 45c6087b47e5838083d1f1d5174ea1868cf3f5919ac7e8f60ca8b8ba6533080a

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