Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efa70376c631ed6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 16:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 454691cb98463de9a3df25eb43da4f4a SHA-1: f81d91d021ff867b67a844c9b19a70dbd8face51 SHA-256: 6efa70376c631ed6b3e43975ddd1ad26038ce9be836fbda494551bd2a211c6dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or SEO manipulation scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa9a04815---fomuvaletabesit.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141636e933c4---losibavisofojubelof.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r5k7gkdgc07p65v01h6dc2b9a1/zekokipix.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/bosiwepupimafaj.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/47281366426.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8799983861378c9210aa9.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gefiritisorejozadexa.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913125232516431.pdfIn PDF document text
    • https://vleek.com/uploads/files/levuged.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/25479852272.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/76566889999.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22258411480.pdfIn PDF document text
    • https://anup.bo/images/files/numal.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fefebenit.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/kimelufapojiwikomeko.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21090815263318137769oa5ten78mr.pdfIn PDF document text
    • http://khocabien.com/uploads/files/2568954864.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/malijane.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/5261565513.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/33658795846.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/40181190061.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/keloluwalaziwasupi.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fasexenoti.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/88315751597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+deploy+an+app+in+play+storePDF 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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 10576 bytes
SHA-256: 668ccd610bbe8defe137a3a3c16d98dc52c582528c7659261eaccbc825e0a0b1
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 18000 bytes
SHA-256: a764deb70ff48c240edb0f85dbeb758e677ceb6dae89c05f2a8cc34092f83cae
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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