Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced95f06a390ae05…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 10:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8d0f4630fe27796ca22786fa2ed2a24 SHA-1: 1a8ab52bd74c3334a917bda9382a2289dbd10c98 SHA-256: ced95f06a390ae054e53b90ed4a26b58eeb711a6549152974e7ccc46f40e349f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of these links suggests the PDF is designed to lure users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/de898bb2bbe126d591681f1d37c7fd75/86576685826.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8fc322d786adfc660fb8d4c4b29ccb8f/jozalemojodefazage.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/gefazazazesebulisomarobos.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/q447897l7v5m3ckvmbd3ti75he/javegemitun.pdf
    • https://alatheir.com/atheirwsfiles/file/58058157820.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bge4l0o3m5tubsbsbgtfndr0bm/vugum.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd5ca9ff66b86428b7e587524991be/bofosewewetamo.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/30c9621a0daba95d1e47ab856a113bc6/20294534250.pdf
    • http://animationcoach.com/userfiles/file/zerejomaposusoze.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/deruveko.pdf
    • https://hondamienbac.vn/userfiles/file/38860178957.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4edfa77e5---ginimeroveximif.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72ffdad44e---nitejavez.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16215149686189.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ccb948013ce7d0e9cf5011fcbb9f3cfc/nezimubajuw.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ec22ec4fcb77574aed60b943fb85de7c/rekukulivipirewumasolefi.pdf
    • https://anmimar.com/royal/userfiles/file/jeginobupoguxuxazera.pdf
    • http://burfel.ru/upfiles/files/tonujijixiwumun.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfbb3faed---lufevekam.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16096647587a7b---tanen.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d96193c7609e87ebdf41c79a77d5808c/fagaz.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3f45873a6b70942e5c29bdcc199a5ba2/47596482410.pdf
    • https://argekaucuk.com/nbg/upload/files/80028989393.pdf
    • http://birzebbugastpetersfc.com/files/file/pozopu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1daa7c589---vozewivo.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/kopivuvuwajaxewosinut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=maths+guide+for+class+12+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin
5ac5a420d9fa2e5c8bb13081b199502aa5e693f0df5adefffe630c3ad7f73fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 16724 bytes
font_01_sfnt_off00010edc.bin
54e677dbf60757a0af1e7b0a0f8d8c95b1301ab5db143862960e4e3781f62f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 11252 bytes
font_02_sfnt_off00012926.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 16792 bytes