Malicious PDF — malware analysis report

Static analysis result for SHA-256 f116e335e6dc37bb…

MALICIOUS

PDF

75.8 KB Created: 2021-09-25 09:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 21975e50abc08fc745204f70bbd52587 SHA-1: abd21530840f265aa28fc4781df0d0785158907b SHA-256: f116e335e6dc37bb08445af16427e94acbc9fc9173e3045ca67486ce818b5465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing lure or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6cd7a2ef39c5fb36181475f0473c0101/tukajavonedakutokisopibi.pdf In PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210917_110705.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/19186632528.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/67023072166.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/2597496318.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/67702853811.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a21ed0de---3234433603.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/23012423069.pdfIn PDF document text
    • http://nineslash.com/user_file/file/62703850985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083f64d2ed---duxigugefafedujonon.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/27902638403.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613151576da23---nenabipebewupix.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5700c2aaf---88456485330.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/xajonudegosusuxigosozarit.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b11a2d711f2f29db4172bfbf51dae417/58606515363.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gunewadi.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/lekedotedipumiw.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/76944802093.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/dazugolas.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sinazakabep.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/7537914575.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wepogugituwakuvivil.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/17925561095.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/54985591532.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/daliwexet.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/60861924086.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/24000700649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+pictures+from+android+to+iphonePDF link annotation
    • 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_off0000bf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3D 11016 bytes
SHA-256: b9512f7c06f9040245f01b538b9bfb00f2bd3aadec465843edc84b67029ec7cd
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 18644 bytes
SHA-256: 95ee01a7bff0276123dcb0d77bfe9e4f7c3b489a942c81e0221472491ab94625