Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce15977f9b73139…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 00:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae269cab93bbf6887deeb530142c72a1 SHA-1: 87441806b9a6f825f3cf66d1640573a1a6ae4c86 SHA-256: bce15977f9b7313941cade7575660bd768b2ce7c8999a7a3ee8ab79fa7844cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. The file's structure and embedded links are consistent with a tactic to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://sherwoodchambergolf.org/ckfinder/userfiles/files/97984042970.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/82816960447.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/pofewafotovopomubekibi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3698c7bf0d---52742220738.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e1d24663def23c57949bc1da59bc0e9f/40309138268.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/pimuvorowoleno.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jamogofaso.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/99882250921.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76448510c---jepekuvanekar.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9df73ca6531a2842e65c207fd3030803/noparixexuro.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/97367805535.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/39217400724.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/retokebeworenav.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210630220614.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5fe10c2dac4efc24510992666041b6d1/zabilumop.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/494762775.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/35262218085.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/bepize.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099191732828---vutunuluzeza.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/701b17496cc2ed1e6534e32798ba2636/nigutuwaz.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xelubifamepegumikusan.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/13490572021.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • http://seritour.com/rsm/files/wuwunanak.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/bewupubifulajejo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/54656290222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=online+pdf+editing+cropPDF link annotation
    • 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 18260 bytes
SHA-256: 235be32ea9e1a1ddfbb56cdf78106900be0dc0ec39386fd378a244edb7f408a5
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10488 bytes
SHA-256: e605c4fda6aba3c59c1c1269c9a33e0b60ba4b2152c1f50665264f251db091ce

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