Malicious PDF — malware analysis report

Static analysis result for SHA-256 013a0163d838887c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 01:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6511266ce7fd2515de89e94c73ff80e SHA-1: b076610c608b630a13f937959cc2b1bd0ac6dcd6 SHA-256: 013a0163d838887c28ea2263db8bdf1cda59d29ecb97ac97395c38ef91f5bd72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=itunes+playlists+on+android PDF link annotation
    • http://hide-bo.com/img/tmp/file/zaxudewisopupowak.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/nuripomalidelotevafo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/duruf.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/35481230504.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/94811779774.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/suboxofudonet.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/79543086949.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/45880535082.pdfIn PDF document text
    • http://355353.ru/userfiles/file/28065145197.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1a722e11dcc9da3960dd9acd7854222c/dovedapulif.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/toxetalizakigexetetad.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9e00e2feadeab548c8887278c6f8f88d/dabifebe.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/14127582290.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/67de73a74f87663123d7754a5df58015/59186424484.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/goniwogagexujizegolib.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/nemifax.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/naxitulobifano.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rhpmi2e2opofmpqphf6rpm8qdt/98581721753.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139605995233---kevewexedapigima.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/kilujajiralebukal.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/73338486144.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/9483092666.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10552 bytes
SHA-256: 77b200c9109520b6e29b991e82973d84d1b3d5da8374cb97a597a534d4577950
font_02_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 17348 bytes
SHA-256: 4271e115823c53a9d5bbe29f234da257cf47b993e08d352f37a70072a5631846

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