Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e6869385dd9bc5…

MALICIOUS

PDF

100.4 KB Created: 2021-08-17 13:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3348693ad76559f7a4f02d9f7306175 SHA-1: 4ce228e2b31ed02ec90c85e701e2914f3502be55 SHA-256: e4e6869385dd9bc5989d9e7958f7ecdcb070eba95ecfebbc20bce826bc5f5c9f
204 Risk Score

Malware Insights

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

The PDF file contains multiple links to external resources, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=preposition+quiz+grade+6 PDF link annotation
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608329a754721---34237736673.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d09e95303---lirelu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/58552789210.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/doxibubofuzi.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/88210624271.pdfIn PDF document text
    • http://fitviewer.biz/files/file/rivolawalokiv.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pakelubov.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1b140544---luxeliditixudi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kp0i41i827odip1nvgmb1o5e10/xejirejixofizevujur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb420bff9---13882534232.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/wokibujabedugos.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210721_184529.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/jozidotaledizezutotilatas.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/12861423848.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c855c98551184b262a100f6016317ec6/41773211251.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d7c99c9ab22a21e4bab925998c52e380/21355888801.pdfIn PDF document text
    • http://emannsltd.com/userfiles/26700994838.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/40226164991.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/pafiwapabar.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowitawodaruvozuvuwas.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7bb60160---gukapinivenuzonejedusagiv.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/ziwovipugakif.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2f97a61a390bef5c3926f0d7c19e7b9b/newabol.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4096540330a823ab1c69deed5f0bb151/zaravakared.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xofetes.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97aa513540---xokixonuzazutojijupo.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_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001370c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 10996 bytes
SHA-256: da57c227fa7639769619bbd67a0ab28e767b29a931788a6d7a700d7969d93bef
font_02_sfnt_off0001503d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 19252 bytes
SHA-256: ace6c3e77d9e67eadd6900bcefc0cca475cdde4fe078039961576952417ac6de

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