Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f66266479c3c158…

MALICIOUS

PDF

72.9 KB Created: 2021-08-28 04:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ad46d7cc3ad51672de26f2042c285c6 SHA-1: eb4ea37c011dee0d545cc88c169a0940fa58a860 SHA-256: 5f66266479c3c158bde90976f321578a852153818989abc8f48587a2d7c84f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=citing+an+online+article+with+no+author+apa PDF link annotation
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/04a41dc5670eea606751a50e0643b851/17264145760.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f89c8148bfb---lumito.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/70592683352.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/86008902425.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/imdsdrqnf2927pcp3mipci84he/dubof.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/387cn9760r3sr7ejvo0k9ge9gq/80986954997.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ddo5s3fpg2ljj2n147hisr99n8/digafowagixuvele.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687205a105c1aba64a752f45d67256f0/xutesofapatu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/rozuvokij.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6548671c61e48aec148a30190cee998e/warazejokogidabofos.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a83eca6b---somegadifafoto.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/merisevosutabekokumobep.pdfIn PDF document text
    • http://normel.org/files/upload/file/lopomufagizanidoleg.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/tesikokejavewanukezufe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8f448790---51238385735.pdfIn PDF document text
    • http://allycatering.com/userfiles/watugitit.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lijubesomoxaga.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/7573444977.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tigixemurapugozu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/tazoborazuviju.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d23ed097---jesokekulonaxuwuzanek.pdfIn PDF document text
    • https://activepymes.com/pub/file/mejuxomigo.pdfIn PDF document text
    • http://master-br.ru/img/file/73877715158.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/ligafe.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510024923667753.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10700 bytes
SHA-256: 5eec8b56a791351d9a45f035af0fdf2339da75e02c707a76062d1535ea9cf5ba
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 14456 bytes
SHA-256: efe58f3e6cf08b61cb459856c9a67554774370291c762b14b69c008588059e06

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