Malicious PDF — malware analysis report

Static analysis result for SHA-256 14aa33a04223e43b…

MALICIOUS

PDF

65.1 KB Created: 2021-08-12 09:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5054bfc1642ba6a1429be661f3dcf7c6 SHA-1: 3ee0bf3cf0e7c4680274f15a54b2e8b95454a214 SHA-256: 14aa33a04223e43b9d22556823a647d3787870ca58167b531d4147a5dc62288d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9088

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://infrive.ru/uplcv?utm_term=unemployment+peuc+extension+michigan PDF link annotation
    • http://cpgny.com/userfiles/files/kixatuwid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afe027cef71---57240346048.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc65118d7d---binebuwibede.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/kedol.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/danakoditod.pdfIn PDF document text
    • http://abwva.com/uploads/files/4615119562.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43235041213.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/mivafazonudalubudad.pdfIn PDF document text
    • https://tigapilar.com/upload/files/gewevemamutosapedesekapa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/80c6dc68ce7171652a08fdc65fbb2554/muxodazixabusisosoko.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zagozubixemed.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b073a352298---kepokabokideve.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/32204487581.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pvinih1c3lsg6a8eoe7k5g2ruo/sojoreliw.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/193ac251b0cb8afa2c7ea87ea1768f5c/27177499766.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pagofoxopuvekumuwen.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210731020341.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76797881628.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rozesobokarubezuditam.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vche1iqp63r0iu8ngk787e1s92/lazojitozoz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/cd4f15698fbd8dfdc36029bfb16c6e73/13798596483.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/fibatuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hjeur95fhvbpnein2j3folcjhl/34773473196.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/pejagofog.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 11044 bytes
SHA-256: 4d8946a96c1054e63ca091e3c23ba2d1e97d75066484a0ea33b3bf845a92c0b3

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