Malicious PDF — malware analysis report

Static analysis result for SHA-256 9028dbf7eccb7ca8…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 05:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3ddbefe3f2a79d816b1f76b2c1af1ce0 SHA-1: 0dd9b1407410d4e2570aa04753238a81f1727a3f SHA-256: 9028dbf7eccb7ca84cc0d46250cd53b9cc7e63f08bdb7172be8cd65138b711fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics suggests an attempt to exploit users through compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=the+subject+tonight+is+love+pdf PDF link annotation
    • http://aweibel.com/Photo/file/7856563857.pdfIn PDF document text
    • http://bptramptour.pl/files/file/96495522942.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/57e8ff552b129b720221c7a4b2d81446/koxugufudumur.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dfcbea91---luleduxiludonagifepo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3f10cc49---46626811365.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vufogunesasunimawe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pphmi2opdskskuoppljmebl3gd/80523997567.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/0b883ff38f2c813d46ba73aa8e0c53a6/90336187433.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e93a9dee37e718f4177830e77b991980/niwusomezefiki.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bbf5f4e1c641f84ac6f87947555e4d3a/dawafukufobewixaxanuniki.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/38113794399.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/sadaxametube.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kcherecca42g0ngeprm506hs1/24405942833.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/75490025187.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/pajulotetirinukedifabeme.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/ruvon.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/70312510698.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160851b81e31e4---nebasupefowufum.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ak0253tvnp00phsf1l3mhuv1bl/51206347974.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/jafofupikabavewoli.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/02s4tgf5pia6l7ajs21um2oi28/8450364210.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67032bfb06c2ae1c9dfbc526cefdb76/43676351218.pdfIn PDF document text
    • http://armanetti.com/images/girejubisedenikop.pdfIn PDF document text
    • http://promador.pl/userfiles/file/17716941967.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 11036 bytes
SHA-256: 81de5b566647fdea96a8989ff3274f05d5ff72f234af921b51bc2a1c967c3368
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 17272 bytes
SHA-256: 69b453fee72039842ac03d8e63bd5f57075dc315c944adfa43fa8b5c469eac07
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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