Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90d0d4317215cd6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 11:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee5489463b589cb59ef89e166d4ab3ef SHA-1: d9b340e030c76bd83c70bc330e294da2b36f6340 SHA-256: e90d0d4317215cd65fc0b26e2f02ed77a644fc2375a78cbeb0b8efcef2768bb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://cructi.ru/uplcv?utm_term=radiogroup+setoncheckedchangelistener+kotlin PDF link annotation
    • http://fitviewer.com/files/file/ferawomud.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/raduxovamawadudiseg.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/pupinujigiluzavuko.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/23e55f7f16a223c6885f536924fed884/zoguguminowogabexam.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/kevafona.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/60018543593.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/4523694030.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/zazakofanotujadabomena.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jimekike.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/3153466854.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/xediti.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/gifirijatafukejovamafupo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136748b58348---rilejukukufelaxoxasiw.pdfIn PDF document text
    • http://sdes.in/uploads/kurivuwijexotuwaf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/52988934524.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/54949614266.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/61687547494.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613426320869a---pewogogopidonuxidej.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/20203484527.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/9475458124.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/xurunikakarerevegulorifug.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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 21676 bytes
SHA-256: 3ec7159b557a577315a1b8cf1437b2a26928541d37426bca67b10914f1b262ef
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 11028 bytes
SHA-256: 93d5bd900bee04a41f44b58881e0766b5a227b81c753d83bd5ec07c7e02c5f58

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