Malicious PDF — malware analysis report

Static analysis result for SHA-256 befe59098f688d74…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d67b4824de7c8957c6d4b44d9e9ae5b3 SHA-1: 13fe17867ed760322a1604b56312458ca1d8d883 SHA-256: befe59098f688d74e6dc90a6892b46a69dbcb36c2e018bdd3a6c1fe8ce7ebadb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content, likely involving a PDF-based exploit or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=periodic+table+for+chemistry+pdf PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/22c8878109de6e347653ba3d273ff431/salesaravanegijisu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43937724996.pdfIn PDF document text
    • http://schubert-hh.de/image/file/2402593098.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/r1lb9akbq0jmgt616rm4p0f2qj/wulasewote.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/84797047724.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40b20f632---xasonugurobesexiba.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/45285977334.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/93031670289.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/87873521884.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/xuduzuxamogatovatavipir.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8b22e290---3434780180.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/zinifirujerunelagas.pdfIn PDF document text
    • https://actor-conseil.com/files/file/50743189261.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460f80afdf---merutelukoso.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/1400832474.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca68365a---58610647533.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/157f96bc2047b7dd8f5dc1087491445d/winefavasilodujiz.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/2326097061.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/giwesibobejujuv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091243412967---76464015208.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/69789836323.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e95a23bc530---xadew.pdfIn PDF document text
    • https://empresa-venta.hr/files/dikosojadedasiwibul.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/13287653195.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/gutunupiwarokenaxi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc952accf---6363993361.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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 17312 bytes
SHA-256: 6665e9ec85f0e6dfa336b7cc59eb054e276dc33e1778011f1a5be5ec5f450850
font_01_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 11036 bytes
SHA-256: 28d1d8ab82a6e0bb26f3e686e881514e2e570e1b026eba28533be3adf4282c09
font_02_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1