Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57a40e576e9c4f…

MALICIOUS

PDF

58.4 KB Created: 2021-07-04 07:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 399eb4b0ca7499f1fe7b4714d2de52b8 SHA-1: 4be862645ac018e4e21968482127157b7484be4a SHA-256: af57a40e576e9c4f44ca7f52a93cf8db8fbf51bd618d7d698a7fedc5e6f8bd02
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely designed to trick users into downloading a malicious payload by presenting itself as an image. The document contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm used to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5801

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 58 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://lyshiying.com/d/files/xiwatogu.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mesadel.pdf
    • http://ampletrekking.com/userfiles/file/rurudozagokiviwepininine.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be0a10618fb---2167714267.pdf
    • http://fd-health.com/upload/ckeditor/files/xokiwud.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c445602a0f---pavusufib.pdf
    • http://curry-box-deluxe.de/userfiles/file/31626726558.pdf
    • http://innospectrum.eu/hirlevel/file/wuxuxizemadokawugikumiki.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39dd2203---tuwagopilojubitab.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7e94895d---nunutifupodexu.pdf
    • http://bafiti.com/sklep/userfiles/file/muxulevajuxavuluputu.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/95f2bf9d78451208f3ee1d2342c2fcbd/xijaguputekasegororu.pdf
    • https://ceccargiurgiu.ro/userfiles/file/96909390933.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/84491722150.pdf
    • http://flygarfield.net/userfiles/file/fakuvokitanufajagapaz.pdf
    • http://www.lnk-creation.fr/upload/file/64061382530.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af71cf152---42566373493.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1e59fc24---45137884623.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdd55c86c---87413005121.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da6f520a0ec---lufowudodake.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/bixederabil.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uibdeg8tjmpl0bfkpe092apgib/lixotakiw.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/01a521f90945562fbcfff93821a535ef/83881109134.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39162870a389c1e1f3f9d9dc04773dac/84793356096.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c652dcf036e---fiwomigalududozi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reading+for+ielts+collins+pdf

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