Malicious PDF — malware analysis report

Static analysis result for SHA-256 72acbd9bc5aed226…

MALICIOUS

PDF

75.1 KB Created: 2021-08-07 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2323d193d1b4e5f49dd47bd843295e8 SHA-1: 570c71d87d014a3940f38798f047ad90507ead7b SHA-256: 72acbd9bc5aed22683860352692f4db32f75716c0b56064cabaeb0dda08e012b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a link farm designed for SEO manipulation or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7617

Heuristics 5

  • 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
  • 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=hypotenuse+leg+theorem+worksheet+and+activity+answers PDF link annotation
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/66fdae201262c52cf861a3ce3f481e08/jetarorunaganirugulukuja.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a85d2c84---31272190419.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b3982a72622f8a1e62cb152b7ed64aaf/witogadag.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/lujamumudimudezijeko.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607578a0c3a54---55081553026.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/gezonev.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/12389145076.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/79f56e859f857b4e0c3be555e4a7235c/94963164393.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/porijiw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181017314462.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/67462571702.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160798a123508f---22704215547.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/2723143278.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c83a2e703b39750e1aa58f39cd7949bd/kitanuxexikewunaror.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/24503624190.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/77533768756.pdfIn PDF document text
    • https://0900107678.com/upload/file/fulupijalodana.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/63312390463.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/womizapudekugifo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/rawumifoxijewa.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b5c857b1---91763820813.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8ba511e---42103301167.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 17044 bytes
SHA-256: a8b1d23e499fd3c7363c63514265a53d49d16db9621938b3e89fbc6b04f813f5

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