Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe3b1148fa8c18d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 00:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ad28e15339df7923dce7498ee5cde865 SHA-1: 07f94a8af9d7f8c5e52deac2500ce81e85298048 SHA-256: bbe3b1148fa8c18d650bb75c3d4b3a5703586f6379748ba60173a3317be7e428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=san+andreas+lite PDF link annotation
    • https://smartech.lv/sites/smartech/uploads/documents/files/29176109804.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd8eb5f9f---39663374278.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44247aeb21ba919a26f6814f1180fd92/wiwewejanel.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/53691994699.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/xarezexisi.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/50121195047.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/rumeduzefipanuse.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/95871469708.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/7235045051.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/49144636310.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/tofozebamizekugogijutenev.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/titezitate.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/69440216747.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9v6iv1632e0via8lb4jhcgi193/sibubuwarojafatigobinuvef.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/vidijelipasafepukikeb.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lamepogapikenomigopop.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/51295529645.pdfIn PDF document text
    • http://hoachattn.com/image/files/didixavapagabapedumiposup.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/komunovozikifozibefazez.pdfIn PDF document text
    • http://wixoon.hu/upload/file/81358409188.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fec75813bc1042e1706eec9420533d21/17411748617.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2c478a43f58c8f739dde1253093bd2fd/loguzenuxunugodurageli.pdfIn PDF document text
    • https://tempegaring.com/contents/files/26981685429.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/73406431879.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_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 16936 bytes
SHA-256: c38f390632d539a1ee5e5ad725e9f137ccb7bdabd97bb92bc8d79d59813c7e88
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10196 bytes
SHA-256: 1e71149312fcdbec491c87650fbe034cb7ec3b288b6ef108b5412df2bafff078