Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed668b5a509b5843…

MALICIOUS

PDF

42.0 KB Created: 2021-06-13 21:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d518d031083c41a1513ed3bff7b59413 SHA-1: 21f4a8173c2ed2e22acd16a2db3c8ca0e0f15b45 SHA-256: ed668b5a509b5843ec05993cf2eb4c4f7676addaba476f6271eb69067659cfc4
182 Risk Score

Malware Insights

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

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, contains embedded JavaScript 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 0.8368

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=grumpy+candles+funny+happy+birthday PDF link annotation
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fe7461a3dfd893d08f02e7ae8758259b/vokaban.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/39447b86c03774e0f3a17aeebf1fd1f3/luvasulozujununuzix.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m2hc0ljahdb45am0rfg5ubk3mc/jazikekonoluwuf.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/jawula.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094992bd7425---pebixivalafovidofepuviv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48cb36eb01---liwemijobozexomafopepep.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/38493604932.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/gopes.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n84jagbn8kvuh1vt6f9l8e90t3/51930599313.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/31548803717.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8f9b6f16---22458056432.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa708b63a3---16612723706.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/wifefadapolobamiro.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nozaxugemedeluke.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607248f1bf9be---boridemidemezavo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/32703713008.pdfIn PDF document text

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