Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb3f8c965394424…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 07:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a278ad2ad8aa5e1e3a612eb3e65d110 SHA-1: d40f70b687da08ccb95fadbeb943333125fac383 SHA-256: 8cb3f8c9653944244d578ba3ab6810ade84694246198a6c1a5d059c7499cf06d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary function appears to be redirecting users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://khiensa.com/UserFiles/File/bisebajovefune.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7dd1431898a911d8029313a457632c32/6922925198.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614500f421aea---54625835393.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/2435821378.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/winawikegeze.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24a85c91f---24490150042.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d2ebfad---faguw.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/57504064062.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sebabanodejezovuvewosidi.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/55640058906.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/31438540785.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kelewelokubimeropibukidos.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/26551278411.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jm6vb9kfik4n93sp1lmjhjbvap/xaruxoxexivokux.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_085058.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/51175837623.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/89232042484.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613deeaec0173---dukigokefexo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/dolibuvupa.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/49548868835.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/mudonowesuvizijafu.pdfIn PDF document text
    • http://yjccnc.com/upload/files/vodapixapojuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bejeweled+blitz+cheats+androidPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10936 bytes
SHA-256: 1d3d3a8f1a1684f1fb4f1798f04534bf97650236c959bfeec0ff79a5aa7e98cf
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 20184 bytes
SHA-256: b89e87a7ab48ed165d840dccd073a51feb52a8cd2b31c68d84272443e97dd65c
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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