Malicious PDF — malware analysis report

Static analysis result for SHA-256 2131b97912e07cca…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 01:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6410fd098e52e8f15ddc95ba867ab77c SHA-1: dad2125108e0053e7b5f3395359b2ed24fff2e7e SHA-256: 2131b97912e07ccaa6d297302f81b12344a3516f682a1cb62db18fbcbecfcfd8
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nawaress.com/webroot/js/ckfinder/userfiles/files/26910010914.pdf In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/62524722772.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/85533991570.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/19411787891.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/66632871608.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/79974565510.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613584e8e05c1---wipok.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pabudo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a8d685b7---rofezazepasa.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/26152472116.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161346ff15c77d---jopeworegage.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tagigez.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/92443481456.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51295820790.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/57340047080.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/biperede.pdfIn PDF document text
    • http://rongqichem.com/upload/files/pitifesil.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/nasil.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/75371781212.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/17149235250.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nudevapogilediwiti.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/51131831689.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_D8CAB23E97C0B2AD.pdfIn PDF document text
    • http://355353.ru/userfiles/file/56879515630.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/45713573708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wwe+apk+modPDF 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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 10116 bytes
SHA-256: f3a04c3665166a6baa729a5393cff2023cc6219fee01533e0b42afd18c74e0c5
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 18284 bytes
SHA-256: 40741e6de516fa3b1e9c55f1f19a7671aaa405eae6492327e01ff38e9bc43952

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