Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b3f77547908f14…

MALICIOUS

PDF

61.7 KB Created: 2021-09-03 07:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 264b0c5f0216ac36e6917c94dcea21b9 SHA-1: 4bf423ee462d88da790c693567728c38ebded5e1 SHA-256: f4b3f77547908f143c50dad677d8efbb7f7d1a20074236fb648ff15ceab3f82a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains numerous embedded URLs that point to compromised websites, acting as a link farm. These links lead to other PDF files hosted on disposable or compromised domains, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8688

Heuristics 5

  • 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.
  • 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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/df3207cd7db965974e1879469e6ea6d1/forubutimasa.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8f5e0bd7---pekidusenifidikizej.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/86d83e954058fa7088e8b3acaadd4e71/11886810128.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63221428514.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082446d104cd---boveb.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/16277611348.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/tawepidafarifasesudin.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5fea6dd49---suruzeramivakuw.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dogajudiwifurapedu.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/91973961046.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/defubowab.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f80e84e9fbb---repinuku.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/zusidenubelurirefevubip.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/47925398181.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcfaf4b24a---52477846882.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/90984819160.pdfIn PDF document text
    • http://vipdiler.ru/files/file/92674854434.pdfIn PDF document text
    • https://geniodelweb.com/file/59481104259.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fijewamesonefelivemifopev.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ojshqr15tgeg2ml7p5maannrvm/kuxedo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/67299356744.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01be12253---loneladapeliviwebafawugul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+biology+of+osmosis+jones+pdf+answersPDF link annotation
    • 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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