Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6086bc626d121df…

MALICIOUS

PDF

98.8 KB Created: 2021-09-03 09:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b2925209fffabef205d0306d3a00285 SHA-1: dc185a208616f08cbc5f6d42fe0a9ba96193b71c SHA-256: a6086bc626d121df48e60a4a1e3a602fcd4f71a2b188ee0b5de822c6f58a3ee5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://huntic.ru/uplcv?utm_term=troponinas+cardiacas+pdf+2018 PDF link annotation
    • http://hosungtour.net/FileData/ckfinder/files/20210630_A4CD65DF5F6FCDB2.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/92956220135.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/52212905047.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/24085530433.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f96ead48c---dewubetefag.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9b21235d---duxet.pdfIn PDF document text
    • https://netpage.info/userfiles/file/23616486049.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/99775418645.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bb53c1849c---bozij.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074491cec421---rilovunogufadadodevaneda.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/628be82ae69e8496c75cddceb95665ad.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/48866738847.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/38954003699.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/43613645027.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/67dfc4b2c72ae3e42e89982daba44d10/tutelujeduberijinize.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/22473080083.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e723d404e58---pufulukatiluwepu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/45249182527.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16094059d1242c---mopate.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f12baea65---gamakatefa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b8fb0726f81f357ae4b2dba2ce1d0bf7/17027028161.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/84747924350.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49437e568---vurozitu.pdfIn PDF document text
    • http://boldogelet.hu/media/66791652052.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611df42804de6---fawelirovipumojim.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6dbc34a28227c3dbcc48036cac236dad/84582053390.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/memogewupasejoxopibezo.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_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 19724 bytes
SHA-256: a240f3e320908b2563f57bf1764b2710b9ff56196dacbff83df2bf09041b2ca8
font_01_sfnt_off00014c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7A 10800 bytes
SHA-256: 2609b4e3718c025e728508da914e9207b4b968e3f79b3249162e4495e687ed3c
font_02_sfnt_off00016584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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