Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc5d231c8b8af99…

MALICIOUS

PDF

86.7 KB Created: 2021-09-23 07:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5eeb7289381214fc24a95636a404095f SHA-1: 714ae6522d4c024d9e0d4a4ac1ba5889dac03ca6 SHA-256: afc5d231c8b8af9906f9d629b5f2ff64bb3045db784d5b8869190661cd721e2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=game+berat+di+android PDF link annotation
    • http://www.koeru.eu/failid/file/roxepejinifolovoba.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/mirekemejarapamefuj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45fb1d036---xaxokuleno.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939ae8e8d4---82462271322.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/94171742730.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210911_D4FAD92DDE5680F7.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/58858145526.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/60977678944.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/jakukujozumoxi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gedoxoxemunaxeperokaf.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/zamunun.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/88547745118.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135454d9f2d1---lumimunaleriselopifili.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/voposasewojatuzomud.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5817976555.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb2c8503f---zonoxojarisuwun.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/76388057015.pdfIn PDF document text
    • https://tsegypt.com/file/66139305750.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/besoguwonos.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/23297845812.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/bivixomitelu.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/davegakikagoledumutu.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 17220 bytes
SHA-256: 7939d4d147e4326a032402dc45d45a94f528207f9c632169b3c94b2508789b7c
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 10372 bytes
SHA-256: f97be2d1ac727ddc4a77548f9b677905ef9e7301c6afac7ad5c40af22019d150
font_02_sfnt_off000135ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1