Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57970c86e8ea805…

MALICIOUS

PDF

41.4 KB Created: 2021-09-08 04:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c763af3d795cc03f86a2b34c758f3a16 SHA-1: 76d0bf1f7366b98b77f9f6f1e905b1cd62883ecb SHA-256: f57970c86e8ea805da36923a6f2be996d76ba2a81bc90f1e9a8b751e7b219b42
174 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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7526

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 41 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 https://sanvexe.vn/webroot/img/files/belixukum.pdf In PDF document text
    • http://shesob.com/file/files/40488406430.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108290356492137.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/3464530377.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/moropagukujo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e71a58a2af1---69443603962.pdfIn PDF document text
    • https://samowar.ch/upload/file/tepidu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/78ade323ebdbe61623639895a2d8f9cf/vozemipavosep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1cknn673d1k7ukt6vife00ehu6/38108980980.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd7a2f80e8b59b23e1ba3167b8cbb2b8/vumamupupedugilos.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210906111048.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3636e3cb8---70675864236.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf302cdc745---diwudovaruwi.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/lemopelo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f2bd18a026430ebd4c37973895fed768/79333825940.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/vifikiriwutovowovolutezi.pdfIn PDF document text
    • https://kawanmto.info/contents/files/kezafevoromawegi.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dosilitogituwaxidij.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lp7m05tlm060vgg1t3jk0gcdql/lumed.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630950799.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/70703757152.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/jijilupivumopijixegora.pdfIn PDF document text
    • http://jp-cable.com/d/files/jegumezosomoxawew.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hfccuidrparv5oi68hkv66nu3/63242917642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=degree+words+list+pdfPDF link annotation

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