Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca20e3f53ad11ae1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 11:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e93cb73acc3022d0084e57067ca43572 SHA-1: 6e4c7973c441324c16a599683adb83b3f566b0be SHA-256: ca20e3f53ad11ae1f21324e9983048b71713dbc453b11594cd2b8dc62ce73d28
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=android+studio+decompile+kotlin+to+java PDF link annotation
    • https://machinex-machines.com/UserFiles/File/lerariwos.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6b48bd0---5799158959.pdfIn PDF document text
    • http://tzsunup.com/upload/nawovudato.pdfIn PDF document text
    • http://web5gstore.com/Files/files/jagoxiwebuze.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/47636c1bc090aa53e47bb059083617b5/jukomozirepesum.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/70806250838.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e05ee0935---puduxajo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e014376f91---62676846246.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/40717681885.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ludagupuwunolanovetumo.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bikamujatazadosek.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/furatirapaxuvunulunujolir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xifudaguroweniginuresew.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l9o9863v48sme3ckkkppouc3cj/62665506462.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/1571759132.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jatozonomadovu.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/faxiwotuk.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5383e2d2---nalusiwekexiwevoso.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/notomugiperedesido.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/13054974140.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_01_sfnt_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 11044 bytes
SHA-256: 1c16b38d8cc8edac2f417bde365a1eab6e1a955d1d02cf76499a90bc0b4794df
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 18312 bytes
SHA-256: 2317231ae7aa1022b1974e198f9e8ba75fc40954f7bf5a7adebf60a015bff68f

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