Malicious PDF — malware analysis report

Static analysis result for SHA-256 49decbf311695ae9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 15:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b8a4fd394b37352b521220f8f63cb5a SHA-1: 7403a5fba8c7730302399657f5e87cf2a8d895b0 SHA-256: 49decbf311695ae9bc1f77f87680f4e0b4215e21fe9daadce322e721a3ec60d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ataru.site/js/ckfinder/userfiles/files/pejeno.pdf In PDF document text
    • http://rafaelokazakov.com/file/44791054846.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/funakuvisi.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/13912341081.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfde6ae191---225365257.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/vosenejuto.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/sisapetixoj.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/xonej.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/fibuzagawewegaruxepopova.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/606a1878524ec11395bc60f91cdd9349/gumegujotutinunowij.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/64138760326.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/gusik.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/fafekirijibuvaguniwupu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7df07144---21337573980.pdfIn PDF document text
    • http://rs-entp.com/upload/file/56508723263.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/jusafesu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16317301699873.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/88586295882.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/mirobefiwubigukupe.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zulenigezevejuwan.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/21433722556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=geotechnical+engineering+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_off0000bd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 15964 bytes
SHA-256: 3acb74f980717883ec9f281cf2212a278cb795365c88dbbf736318da387d07ea
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10768 bytes
SHA-256: b97c96a815e5605e6e523c9eb9a5d44b39493d93fba0bcedf297204842c09888
font_02_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1