Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da4a77f1ac70cef…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 16:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 98780f8571c93fdd8c5059b7e34e3ef6 SHA-1: 3bdcd3653dae4ea8f867224e442123faf93a6544 SHA-256: 7da4a77f1ac70cef5455f672828c53b705da81fcaa183718069b00b74d4bd6f2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also functions as a link farm, directing users to multiple distinct hosts, some of which appear to be compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3528

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
  • 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 http://chupanhnoithat.vn/upload/files/77872553151.pdf In PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/nonakepelufakovudonutokad.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/denubowelaw.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/vawutetikiw.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/sujupovonefijixedomes.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64e9cc73560e4486f2b68ad10e0a2fb3/26708660010.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2c55f26e5bb633e04f7b4417fe95284f/61513669460.pdfIn PDF document text
    • http://anpo.vn/upload/files/tigegezivunugoxilokezara.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/kubariretiv.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/30459821137.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/vexujejevinel.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/68111566572.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2fc0600a5---golijizapeluxi.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/34536847844.pdfIn PDF document text
    • http://mylodge-naoshima.com/pajawanerekog.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tlc8eo0kqorntpcm4tm8oukonb/82950987926.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/90488344791.pdfIn PDF document text
    • http://119pump.net/d/files/84784055037.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/tipub.pdfIn PDF document text
    • https://bawauang.com/contents/files/54712848946.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/90372553642.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wolivizob.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/68485815053.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/57958729242.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/40811956090.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/vedilezewaxubokuzejiv.pdfIn PDF document text
    • https://rotitelor.com/contents/files/denobototiliwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adult+jokes+in+gumballPDF link annotation

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