Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b8f713ec956809…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ead20bcf1660e5fc26a0c8f1432a31f1 SHA-1: 824580e6f3ae561430018e4526e26be9294e14f3 SHA-256: a8b8f713ec9568099192b9e83ac71539043da545bb871cc9d3ca24deebad3c67
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, indicating it is a Pdf.Phishing.Trojan. Static analysis reveals numerous URLs embedded within the PDF, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4271

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=jimmy+carr+gay PDF link annotation
    • http://littlepearlbooks.in/data/eimages/file/31027728474.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e184fe7acc29a789c9b99b0ba7a49e51/lofutoduforuze.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a923ef82120---bisesubezo.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b60a57c58bd59c0bac21da155d7cec6e/xesuvav.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9206701e8639b03a098424a11ae1748/xuravibudoripiwosami.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/rifow.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc67324db3---32980702014.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a3aad3bf---sagetuvoleliwexidumegoron.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/11480273906.pdfIn PDF document text
    • https://susta.vn/userfiles/file/93394294285.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/95139317267.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20e1de826---41385297207.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b069a556---xuxitezegifemovilexipo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/af05f93365f6c44bbd9dcb0a2d2fc106/xalibemiloniwefutonifexo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0a023d4dfe6b2a73380ba2a964c7129c/vopugobolipimiferup.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2f4540b6---rukobiraxivolinelusiv.pdfIn PDF document text
    • https://promise-land.com/upload/file/damipexeronad.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e8f061ce04b3ba3aaed39e6780c728d7/fupewebufipapova.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lasigones.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/579d7755b92e31207a0a2ddf2c62a5a5/gaximorovatenutas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9b1125c0---gubulogife.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tululokaxekudarogoxesotis.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5453c08a42217d9a8ff071f8e7f02b6e/52279617254.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/sekokanusinenes.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bf5ae34a---fobasidevikiluxibep.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/88566127305.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/zotosufujubakaku.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d86383f5---sotevoti.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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