Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dadef3b51259b21…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 14:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20bd055ebea5a9c5ac1450d370f49f5a SHA-1: bb7d0ff80e62c3bb43e214532361bc6a3d92db85 SHA-256: 8dadef3b51259b21a57f501d4de319d800b8b6c2bf247c8889e2ebcc23b37e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS upload directories. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://jarosi.hu/files/file/nibogopamul.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a6079f4df---xevubililizuvo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1d8e9b9a83b1633de6d7407ce516f916/87305853580.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zetumokefez.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/23768345289.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/48129621150.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/27659638595.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dumotumav.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • https://cargobull.cz/res/file/lufisapefemexelupizaz.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f288341032417f35c26d9222e97aebec/33979887079.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/20040659229.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/67240195104.pdfIn PDF document text
    • https://alutat.com/data/file/50294243111.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ea57b37775724cc26bd145de99328338/65924574731.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/c1iuda93dc82kmr7hd1dg4vdt1/jabinodujel.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2715741f4---jojufeb.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6edc04cf---veditosukapawasepuruwaj.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/78993987327.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0aoggr0k61dgn80kb10q989clj/10875743632.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885580ac898---58973473642.pdfIn PDF document text
    • http://yejida.com/userfiles/file/12632666007.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609678e765264---tuzoropovigajabimit.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8f44b37d39706d9de7b1dedc42c03e10/74088514491.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc39383273---resofiba.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/13dcc4166a3d7955f7dbfff157c31b4f/18679390016.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07b05c630c---214194394.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pozusifikax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+honey+pineapple+glaze+for+hamPDF 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_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 17080 bytes
SHA-256: 7cd8985c00a92b6dcdd8307bd31046d2174b882b12552c059609582b7e3ef116
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 10980 bytes
SHA-256: 43101c7ebca5271be2ced36b7815caea8c2ffd7c31fe82621a88be03454230a1

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