Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7326dc95e9629e0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 20:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4cff471bb0a414ec0d11b7dbc073bdc SHA-1: 44828ee86db34c437404ec7e3beb2d2d1e81b6d9 SHA-256: f7326dc95e9629e035b6ecdc0f25f8f7078cc91f9438b16cfb2445012203b6b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ngonluathan.com/images/ckeditor/files/11426934779.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67267fc0b---69626403541.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16110e6a27d340---nipelos.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/juxevagi.pdfIn PDF document text
    • http://unseretochter.com/images/file/gijepodezaru.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53d935977---48646925322.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/vunisefuwemuwapararo.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/61a8d6657f2cbadc5da7b9b0e5dee19f/wobasasadusi.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/xofoxiduxiwuzuravog.pdfIn PDF document text
    • http://coffee33.ru/archive/file/sanumufufidisarev.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161042c241590e---xupobineputodit.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vuwakifibajujoxetipimevad.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/61843583874.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/javulewigenelifakag.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610adc98aa903---16642074589.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wegubegobibegozanelo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/tuwivelebazizagulesexozan.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/34855350256.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/butigemoniboxa.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/3uibnm907u9ss0m2utveeesoi0/puvesawazukamusimesa.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/mimagogo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/lebemomitabasimowimotu.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/vubumo.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/polazidodi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780440b5638---dexur.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/xigoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=examples+of+tenses+in+english+grammar+pdfPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 17580 bytes
SHA-256: 18aa09e599d3514044a4482ea019ea916ffef52cdeb5b1a57d08a66c6ef62f0e
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11028 bytes
SHA-256: 4a43009eef93277608836ebec778327227c4c7dd03b523226edafed06904c37a
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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