Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1cc2d03c32af94…

MALICIOUS

PDF

78.4 KB Created: 2021-09-24 05:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a24e1212df737fc4a60eb117c8381e76 SHA-1: 6f6be4180c517f7dd1ffe9520bcc5f046ffd29ff SHA-256: fe1cc2d03c32af94da2b20ff17c24f7eb5d5b3ee6915bf38391b563f3f47105d
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, some of which are hosted on compromised CMS platforms and appear to serve further PDF payloads. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading and executing a secondary payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+accountant+2016+torrent PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae65b34149---dejobaxewivulibuvuxupa.pdfIn PDF document text
    • http://ijfbn.com/editor_up/rupirikes.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/71612946759.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/baradubevawusabiji.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/metutugerunixukakefuxavo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/57814930061.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/90329276503.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/kederut.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/48830543657.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7169b552---wevigezavafudo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613375ff38ccf---79724530704.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/13540183201.pdfIn PDF document text
    • https://negaratoto.com/contents/files/wopigawonotibosafavep.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/ninevivoneramoxota.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/21246128132.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/83532078269.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a18a380432da6e9985424654977e59e9/90989935723.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/lepogepum.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/17521012946.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/piwatorekoxodetowuge.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/jemakosonupejovalejat.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/75246963028.pdfIn PDF document text
    • https://oldgradeducation.com/ckfinder/userfiles/files/10461397641.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_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 18364 bytes
SHA-256: 4599a2b9b1762e32299c09fdf8b6a8d3ae9cdadf1528f050a9c427306ea7e41b
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10548 bytes
SHA-256: 0af53f5b620fc8580f28a36bb0882497ac11e8e0e0bca6fa2a01709380b12d7e
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1