Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e99e4fb9e5f68e4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 00:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2035031d509dbac72a78883dd0099fd4 SHA-1: f8d38ede4f1b5abf8be4df89a07326908cfccb4a SHA-256: 4e99e4fb9e5f68e4bd0c72f627ed22e65df0cd86d2041ec0b2bfdb4eb84d1f91
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=moscowin+kaveri+movie+download+tamilrockers PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd615bd06b---78443198289.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/20642462254.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/zeresanogakasorikodaj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b0f73063d3fa81a4b4f6d5e2541e86aa/fopepewusesix.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/44219958617.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/xisabizusavamimagotamun.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hg4bfm2h7os2ahmujif6ss2l2i/kegip.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/66984321128.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d9e5e9486---72912234938.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/25285165653.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/pogolupiwa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088561eaf777---wivaku.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc29831bee---11795406494.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/fefowopoxororotuzefomera.pdfIn PDF document text
    • https://maisonforville.be/documents/file/37834507149.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/79081148713.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160947a612cc2d---25321125210.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8vc3vbtf9snpl0kv3eoqrrfv12/99628889806.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/49307556189.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36adcd4871---35633878935.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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 17484 bytes
SHA-256: 03f98e9dfd815ab63077275a87db0ce7c8def9408a3aada2ed9e2815260aafaf
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 10768 bytes
SHA-256: e75937fd3a0a15e17484797f57bb264bf2d05e51a09bac4dc523e70ed73188e9

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