Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c09f365ce00fe3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 00:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a4755e49d0edac293cb5cd926dfb4bb SHA-1: fdc52576d2d970d8a53601118d8cc33f75366779 SHA-256: 08c09f365ce00fe3f10ff86aa0b2f05f607266ebe2d46683655de02bcd07e8b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mikol-styl.cz/userfiles/file/jukujakarino.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/44319113132.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a24542b571---xolezavuk.pdfIn PDF document text
    • http://gibisch.com/files/files/92417986999.pdfIn PDF document text
    • http://jadeite.ru/images/file/pejubukujiwopobadozetewo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/5457238683.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/vimaxan.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/denugizevuwavolupolorawa.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/xegukagemulokukakagala.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b713094---venakikazotemusuziweke.pdfIn PDF document text
    • http://birdwatching.sk/media/file/giroberutibexa.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/zabogipekamogukujezobo.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/22895225005.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145794c94de6---63213505042.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/46830461444.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/989883247.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/pomaxijokomigilejotot.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bulatolovirunaxanozexa.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/josulunowimagos.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/98190934173.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/puvakegovotekizoroz.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/53528590781.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/52076668309.pdfIn PDF document text
    • http://ty-int.com/files/files/85252348.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/32804606518.pdfIn PDF document text
    • http://rapet.hu/files/fozipisazowis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+download+free+music+onto+your+androidPDF 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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 10928 bytes
SHA-256: 7392a4ea5520625e930707339f1db7604f2d8b7693e38c4142bc33fd514c653a
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 14464 bytes
SHA-256: 413c1556dd3c5d35ab1ac2f4cd675d9e233dca0ce1a10c0abdc972998b4c8ae3
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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