Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ebd9e785033f18…

MALICIOUS

PDF

73.5 KB Created: 2021-05-04 06:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2712fbd0100e15ab5b41874986a50e0f SHA-1: 3da3601aa54ff760878be2631c90fbc96287e549 SHA-256: 01ebd9e785033f18d0a9c42af14fc1c6a800910c00ef6d03a48f45ac1931d93c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9168

Heuristics 5

  • 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
  • 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 http://aeronautike.com/userfiles/file/99875341311.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d969c1e3a---muvozebolukud.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9fabf526906a1d4dbefc84d045b7f8bc/xexuxarojofo.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ac13828ab7e51522c1b091e1080d52bb/nenuxugobita.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/q1m8egeafm9j8f20t1futj08bl/26206297510.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160717e92ef544---zojudomixer.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d9e8da2e---28330891301.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a63215bf---52253937035.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/91215566cbbce846e0ca48f7dd550b5c/57729667757.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906c4e13f4a---susuluzizujulipugadab.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1t6vaa02a5t6do34lnsgici58r/72700998722.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1b1be409a961b2144951a09071f7d403/zuxujugav.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17dd2995a18bfe1b1999ab49388b76e5/58436765736.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6146945e4---45144842737.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a6d6cdd12be58df276ab175728b7dfb/78294403579.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exemple+de+projet+d%2527+aviculture+pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/111d0388bdea5f7032fad290ef76a5b5/gevilatojava.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee77.bin
c01045c6972a9a433791ff3b94e2123032fb7314ecf3c7ff3ce7a6cb965e1e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5320 bytes
font_01_sfnt_off00010092.bin
59fabf4bc15377a204d77e299a5d2a3cd27d484257c31aff002b047569dabf99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 12488 bytes

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