Malicious PDF — malware analysis report

Static analysis result for SHA-256 df11d2ab988fbfdf…

MALICIOUS

PDF

71.1 KB Created: 2021-10-05 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5948b4dfeddd4704f177decef1e89cf0 SHA-1: 95e42d85c1b693db8bb4ba12a76d99e7ef114e5e SHA-256: df11d2ab988fbfdfdcd4e5875ff14eaf2247e8d2d4e12b5f28e780a68ed3527e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or lead the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=what+does+an+internet+outlet+look+like PDF link annotation
    • http://picart-personal.pl/fckupload/upload/file/dulutatutupefa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vkdsnlb4pn4u4ghkqkgvgmoh7j/pafokijabopaxoduvowagubad.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/jexazimonedagugoba.pdfIn PDF document text
    • https://kham.vn/userfiles/file/79032455584.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/molagilize.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vakiwufufunig.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d20bb5cbc---355586649.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/gexewejud.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/57945f4f06bf99d8965e27b8f6c27a70/68595875091.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/81989833238.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/misawopolovekatipivi.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/38257470030.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vineroz.pdfIn PDF document text
    • http://bociany.sk/media/file/gunifodunefabim.pdfIn PDF document text
    • https://poker-fire.de/file/jijunizazixu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161458e7f85380---18885236494.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fobefokiluzirotunanufiwi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kakabalemawapenulu.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/dupatetutare.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/29605321844.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/25024667977.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/jonuferusuf.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/diwaxodepowosaz.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_off0000b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 10532 bytes
SHA-256: df0cb0d50f91f5508736e8242ca311879d54dc06caca91b3ff86e3bd60845665
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 15968 bytes
SHA-256: 4784cb9f177080f14be84694724f4c8b6fabdf86c038efffa4f3866a5cfb7b1c
font_02_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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