Malicious PDF — malware analysis report

Static analysis result for SHA-256 effe863fa2e7f5aa…

MALICIOUS

PDF

87.6 KB Created: 2021-08-17 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d536d698f81b88f7ef8d63401443e58 SHA-1: 78a11f6d28536015ad683d92a68c15d1385a28bc SHA-256: effe863fa2e7f5aa546befe55d76cb0f0d52c2d114bb483e0ddc05bba3fb05d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://coretry.ru/uplcv?utm_term=motorcycle+racing+games+free+download PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cc4c24ee82fdae954341bbd78f0740bc/laronixekazabe.pdfIn PDF document text
    • https://stauber.lt/images/files/bunenu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/6653668776.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/xugunokanupibonaw.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/g50tquh3jur4lqq7gmch0ao7d4/51679825694.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/43708314095.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/17ec33974d5779635275b1a07319f3f7/warasipifudelitepekagajos.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4f7a9d669d3c0496aed2b0084ab5bd89/gepabanuxilimidi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a43da8f43cd8e64d18d22ab9a20f3647/32503923033.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a473d0ab4ab---liruwoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dec41c49a---52303964577.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/86642011239.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf10682ed---rabozas.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b5ac8d23---zariroxobede.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/nojoboforezakereda.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/tibukitewuk.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/xovanu.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/zidavusef.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/menosawenufubozi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/35878210125.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/femawafakado.pdfIn PDF document text
    • http://aps-mes.com/files/file/54196789529.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a4fab99b95a565c59f45aca5f37fd28b/vikoxalipasobinafofedukor.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f11292f30---84129413761.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/85002376238.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c3c7c201---95326474638.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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16592 bytes
SHA-256: d1d0039882f3e906f056f42727eddc8f0589e95e0eb84859bc9718028d39e1df
font_01_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 11012 bytes
SHA-256: 8b97440c4073180b063f09d3d4e34eed3e527d00cd13be1073d48ff71a068e6b