Malicious PDF — malware analysis report

Static analysis result for SHA-256 04eb325fc3ab2720…

MALICIOUS

PDF

86.9 KB Created: 2021-08-26 09:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e00d9f8d98fb15e820162c1f48cbd613 SHA-1: e137a48d1144061c88188e5e56e16d8506fb18a3 SHA-256: 04eb325fc3ab27208efb2155bb0f9ab0fcc8c14c9b97fa518e08b7f2f7d85dfb
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. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3c728a41e220fd86e852bbeb331e32d2/jofuge.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ac93979---17576749952.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/59761ae7d90c258fef45654fa92ebbcd/4017546918.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/85964632711.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1e663d5fd048106a2280896a3e3afebc/12958877477.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f2aca859520127c7bb06ec3dca150507/badigot.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zirufitowetatuwisojoj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e9f5e755---zerilezabovojixivopi.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/21318710273.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/soxeruvuduxo.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/pojojipatula.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908c5292ce6---xugekazawudedote.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b673dc5---zavag.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/redozoxaxanoxaraniru.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/fototaronuwamijabaxi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/303107846.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/86420103349.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/95238383987.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/bifidomorizajij.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70408e7c01---niluzizasokezerizin.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609282d42e43e---60614246219.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kimoruxakoxenelusef.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7npumcedgksivsie3r93vjqi77/57284855570.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/94399403978.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/53016707428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=peter+steele+playgirl+shootPDF link annotation
    • 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 17628 bytes
SHA-256: 336b84e6ed4b1e23e95a5c85cf4d2fec256d1ca89d11dcd58fc8d1c660b16c30
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 10540 bytes
SHA-256: af68748ac32185f2f78204fb84b8dcfbfa60a1923858d80a02f8ca7cade8fae7
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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