Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cbbdb1bb9e2093…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 17:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d49db961683114263620120851072b13 SHA-1: 50a1de246b8959b479e8383d994704039580bcbc SHA-256: c6cbbdb1bb9e2093e2da03b258fa4cba4ee02a73c46ffba404a4a61e03b9f2bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to potential exploitation or further payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=what+is+the+command+to+make+it+night+in+minecraft PDF link annotation
    • http://vaynhe.com/upload/files/zolararab.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/veguvizodu.pdfIn PDF document text
    • http://panteres.com/files/files/pedofonodubabaki.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/60aec650a68c6b6b06fe5c5c1fce9d35/71303404047.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091209172349.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/pizumepabesolofe.pdfIn PDF document text
    • http://ruresept.ru/files/file/32348428333.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/30513215662.pdfIn PDF document text
    • http://heureka-cz.eu/files/redisiv.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/gijovobaxibo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613412d542549---32613815440.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/tinolij.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/togadi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314941b1b6f---najavujuwosa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ed8a45b9617a1c95602a3beb40bd9ab/puwuvejukifurinalapam.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gemumekesigoxigopajota.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/29889063525.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/dolakupasuromosibulet.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c717f8577c---46135417675.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/fafenibanope.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kowobavirorur.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_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 10964 bytes
SHA-256: 0682e7171590ff7ac8f2b70bab77ef9560928c97f3320ab0713bc72601748438
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 17744 bytes
SHA-256: 4d549058dad53966a74f33b06e0633fbff660c5994c187a4a5ed67bb1b523634

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