Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c80cfc161395168…

MALICIOUS

PDF

77.4 KB Created: 2021-08-05 22:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b5a29989693d03f7dacaf2b9f80a011c SHA-1: ffd571b101d723605c2002c7ac1876adee630b4a SHA-256: 7c80cfc1613951681c4442e46e56c5506e1f368352d0e5fa0801b22fd00b8db6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://oniceh.ru/uplcv?utm_term=prepare+to+be+tortured+ab+jamieson+pdf PDF link annotation
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/49vl56nrs37amumi8av7p3df72/falodadufig.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e83c212a---diwidufesirek.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff78071c48---18609935911.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/31e3fd766360a5ada23763484f7b3835/sukisafeluripusedaxe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b2534b437---bamivarejanosirojodu.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/9702677351.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/155518c31cc0904df4a5e1d07b015a08/munibunamubibitofisev.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tuxozo.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/37009577347.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fdec19795---novoni.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/pobab.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fbbe24c41cd5f1035db05b963e654a21/57981578939.pdfIn PDF document text
    • http://chinalabware.net/d/files/34949069852.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfbef38d1---28908348473.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3c2b2915---61808026041.pdfPDF link annotation
    • https://condicionamentofisico.com/arquivos/file/48296109189.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/rebewosomoda.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc5a57da0---wisafekenutuzodiruxi.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac83650ef47d67d6d86934b02e30bf55/90818969259.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/nojiwe.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cd5c700983c19450d2b451734cc10885/94429272400.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qludcuf4r9n9mc2s2usaunkjnc/81060496236.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 10984 bytes
SHA-256: 33548f0b986b18543f18a534379f52b63464d42defb73600e64e169e30ac53c7
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 17172 bytes
SHA-256: aa5c2d49079c61695d75e53e0c4365ec3bc5c6a4cdfde7d277c46d1c2d4dd751
font_02_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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