Malicious PDF — malware analysis report

Static analysis result for SHA-256 469a42f05d09e8b5…

MALICIOUS

PDF

62.8 KB Created: 2021-09-03 22:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 219fb6c854dcbdbf35a3cd7167f27f8b SHA-1: 48b4180d6496b271c9af12ade13886ed3a4c90fb SHA-256: 469a42f05d09e8b577b126a4d4202f83d07cc83fa323ec1c7c74ec4429dbe932
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=units+of+measurement+time+worksheets PDF link annotation
    • http://jshtextile.com/UserFiles/file///3290843111.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c763c0290---tadawugeleda.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/baxitavigexekelabese.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb5de2fcc---vivipusubifupekemide.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126821510b2e---kokavubu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/67000563393.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wekijejawavijojazuvunipi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/guvadowatadedeku.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f2a784e---41452440199.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/22939443154.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/436b51c3ca668e1218a9ea4af081a670/patesebinun.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/21573283129.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/22518290226.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/makuzofujujakemozipumiv.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/71000216130.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/98617034105.pdfIn PDF document text
    • http://eventechsite.com/files/files/puzunex.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/dudujironezoditovuxat.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ce8bcaebb720654cab7086eadd8612c3/47894145765.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/bukiwerosap.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/vudufexelifa.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pisoxosifubomagofide.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b3ce259---xojiniveta.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88d26a329---newefa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efd87b0ae---gilirijuditeworolava.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/buwibigepuxipexinikid.pdfIn PDF document text
    • 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1