Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2cb5e91c2a9641…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 12:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 927be9e28e9a4a821240e92151af21f6 SHA-1: d20ff62853e8daf859bbee32ffb06548d2cc3985 SHA-256: 9d2cb5e91c2a964116384d96629ddbda6cb4691c3692852978108cdd753dcc95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/c2h5026mpqpvsn3ktsd1tg96uu/bowej.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tinodedot.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6fd5d2fe---82560466930.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd4ad1b14---38036316649.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jaxikubipedotip.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/74752706429.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45e338d172ff63b7bbf0b9e5e35c2503/87365359567.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c273bbd4---18044745483.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41c7983e9---57163377479.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/22113419021.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/92026931034.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/guluwexevujabikapijol.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6cbe7fd---zomazeduga.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/lipesubufaguzoxetafur.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/66010099260.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mizidetafaloxaribupenat.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6683e5fcbe5c782e4c9e9de0eeff57f1/sosigagegosaz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/cfc29fe2b5f908e46f93619744903886/12799136069.pdfIn PDF document text
    • https://actor-conseil.com/files/file/68490157472.pdfIn PDF document text
    • https://buka.ru/sadm_files/bokogiwidegokowukodu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/66598374839.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/37849625418.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qeffpu0pu6ht2487s9p9cbkql8/55559504175.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/45084529591.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c442056c030---28455213177.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/91956813801.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab940e0bf1e---zimorolejepugapolakud.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xoluveresesesifegupakoget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=big+words+and+their+meaningsPDF link annotation
    • http://bit.ly/1ybnhrvIn 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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10788 bytes
SHA-256: 7f006d05db1ada4c2691734270cff34429371ba443bf945fe59abfa0df952015
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 18200 bytes
SHA-256: 67b2caf998c5e18eb8e65dcbca0df48971911d1180eb80d090922c3010472da1

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