Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1daf0cd7604df7b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 11:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e445f8c1be3bd68f8ff8b871ad8e35b3 SHA-1: 68eb805e37680e86034bfab324a2d673c7853069 SHA-256: f1daf0cd7604df7bd6bcbb52cd8191739de0c67c31ab3075706b52f82d653607
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

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://allytemp.ru/uplcv?utm_term=upper+limb+neurological+examination+pdf PDF link annotation
    • http://quranday.org/userfiles/file/81519352104.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17b77d183---tunuzunuvimivetofo.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/58639868947.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/65ih3aimrm55v0602719pc04bd/32407448367.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/cdf7aa4e09a78229aadf39066c8bc340/75078821077.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fowirapotizofotepe.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/zibonumugolilagobu.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sutesogabimefebetefa.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/22512928512.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/epa2777o3sqldbs84ss68270fh/fudamedupojoba.pdfIn PDF document text
    • http://eternoohydro.com/d/files/pinedexupopabinedex.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/turadamemosilobumi.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rusizimozezib.pdfIn PDF document text
    • http://gibisch.org/files/files/79807015870.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/80879065781.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///61802822047.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/bivokeguziwularof.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a252cc7640---98037876906.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lojunijaxa.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2361b743---79239946395.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vozodumozapopoke.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d962090575---wetunuvo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jo8ho3aqvdlj7ongs68gjdin73/zilivamigirigenelu.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kikemimofuwufefi.pdfIn PDF document text
    • http://sdds.be/userfiles/file/66476115379.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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 11144 bytes
SHA-256: a08c9eecd3a3267bebcc26310bfd97dc637e1bf0396478bc912796416e4cab5c
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16912 bytes
SHA-256: 2c1c8587b84bd3457d847fdeba396cbb2826cc15d9ea84994df705cf42bd8654