Malicious PDF — malware analysis report

Static analysis result for SHA-256 119a5abe7dc8b2b9…

MALICIOUS

PDF

88.4 KB Created: 2021-09-11 16:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50509c400c2fd4c752efda5f06065aac SHA-1: 00ec42a11a12204e64d6db671dea9950fc7e82f8 SHA-256: 119a5abe7dc8b2b93db8a7d72bdd16c1000c1147f86eb4c3ff8cf7089a25666e
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The primary attack pattern involves luring users to these sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=my+hero+academia+movie+heroes+rising+free+online PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b14a36cd99fc98652607b7c7ab6cc720/walexebujagizegakowumeveb.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/33248379432.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/83622297858.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356edbf24e6---89441507473.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fexoduwufubix.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d519402c---19156863631.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/40334323061.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mirqqcq2vjosh96v7gn4ncpgqt/81816912911.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/47839570302.pdfIn PDF document text
    • https://fond.ru/userfiles/file/15050146351.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vl3704sihnf5h4vukcfduf4jpv/dajoka.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fodubane.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/sevijazawa.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wuwawutavenemoretaziv.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/riposedibunulesat.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nudapitanipevovupowomud.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/38334024866.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bupawaladokonuxov.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/55396843073.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/18472354366.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/xirovokuki.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/1851857787.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/texidakofawiriruf.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/vopile.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_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 21624 bytes
SHA-256: e6d847945cc08b7de904544bbbfdb81bbfb576f1b319226e7186377a0ba106cc
font_01_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 10996 bytes
SHA-256: 4a5aec03943136cac70351372374db5404ac3e52fcf982d55e60986c1924dbc2
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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