Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b673548511ddf11…

MALICIOUS

PDF

85.0 KB Created: 2021-08-07 04:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 543e76c473469fcdad25dc13015f456c SHA-1: 5e61f4599d54413aa2443e5d24f2a97de97dd9fd SHA-256: 1b673548511ddf1194bab70614a440684bc5d4afb7e2abf4b4d1f7bcd2c903a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. This suggests an intent to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=literary+devices+in+macbeth+act+5+scene+8 PDF link annotation
    • https://dycmc.com/DATA/upload/files/202108060409218622.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/batavimakutegoxizod.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/34913432400.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/kifirawivafodawatit.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c6b98e63f8543aa3be8315497a559abe/lesezitumetanadepamemun.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/00928ade65f3165eafdadef24d4435de/95145179461.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51501dcb77c6878d61f3dbd4ed05f349/70999720873.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/rukumifuwedolazalamirulu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/213bda9cc9786dcadefac54e3a2b79de/rekuninevasikowum.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/19450182521.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0fac2d4f---kobaximodilaz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ccda41ddb---folobudefoxowo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/ripusokijevapemot.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c197cea1b2---40125473812.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c5d8bffd5---dosenupujewazan.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d65291db955e6094ef6fe47c3b507f6a/97132908972.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7bcbc921---dizupuvodamomupidifasijen.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/desodaza.pdfIn PDF document text
    • https://buyafranchise.org/files/files/6208930425.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/209u1vacer6km0q48d9s1q0q11/15929407572.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xosuden.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/76117819393.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vaworiz.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 11088 bytes
SHA-256: 3f5ec6691820da09630b87ed97c49166855bee2813a6e46b0b08f7885dd27f20
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16904 bytes
SHA-256: 2ee940deea8afd35331544b3173654ed62fe18d39a706c5d584d555e5675c7e0

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