Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ab920557df7524…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 21:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21fe31661cc617730d32b4fc845aa766 SHA-1: 329530a418dfe22d6ff0eadb756bcc9e77fbd186 SHA-256: b3ab920557df75244c0e42b14574f186c2bcb6dd67a23c982b5c32f30d614ce8
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 file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://101doctor.com/uploads/ckfiles/files/60b4d26999d85.pdf In PDF document text
    • http://flomojapan.com/upload/files/34746015062.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da309d2617---14711136499.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c18anpdvkg6jd9p9ujhubqnmla/pegatonozezovimajatubu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/pekutifesivijifedakivosuz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zovufiwisenawifabirud.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133448d74742---tagabovabexilinopa.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/busevetug.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/19952496642.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ec86b792fb75b9045fee2f8fce2d427c/57055395579.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161101b87d4d43---kesipokoxokofexugubap.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608358114ce28---6081352640.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/93253377141.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/7353685045.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/80307170211.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/71190576931.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h97fmd1866udu91k80kmcfsvc6/44186712585.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8j8hqlc73rku3mf7p19mrcn3b2/39511249986.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607448ee3cc80---nokakiro.pdfIn PDF document text
    • https://miet.hu/kepek/56685278470.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/85220956038.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608928c38a08a---danoj.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/sagilonoredivizuniz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2iaaahihvgrkfj04lte0scln92/jabuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hot+springs+vanguard+user+manualPDF 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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 10892 bytes
SHA-256: 94d5a858fd3e15fdf4449590dec84ffde153c11e1cae493a89e742a13e08b334
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 18236 bytes
SHA-256: dbf040eba6dacdf0c431f7afc4e3e2537f65c402e7c8f0e697546c4ec02c5ce3
font_02_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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