Malicious PDF — malware analysis report

Static analysis result for SHA-256 4747aa61967a3d47…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ebeedc18ce420df266bf8b93e5fc2e SHA-1: dca33ed41ef691d04501209408df9c278a941d45 SHA-256: 4747aa61967a3d4705c4e3ccf4ab9895ea2d3a0665ef4a9025ed0d375a5fbbdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content, likely leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://floridainvestment.cz/files/file/25890383879.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/93268c5ca4e2615926acb7363e2075df/42064062752.pdf
    • http://elcampoeco.org/FCKeditor/file/77477353348.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098234eebd8e---81945374699.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084623c02073---84880386396.pdf
    • http://angelcabrera.com/FCKfiles/file/xusolexumepoxaxe.pdf
    • https://ngusacdon.com/upload/files/50984665990.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f404c34---meripozuzagasa.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7775b458---gaxupefanelosedakibirom.pdf
    • http://fandimnarodaku.cz/upload/file/85052850436.pdf
    • http://prestopc.it/upload/file/12807705129.pdf
    • http://chataphan.com/file_media/file_image/file/28505444756.pdf
    • http://albino-pitti.com/pub_img/file/poniwilogi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kg78atu8b1fektipr2sjo8h49t/memutakebaputipemavowi.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c330a151a2d---50203085120.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7192729e6f---98638193272.pdf
    • http://jar-ted.pl/file/dunalamev.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9423f1aa08---70310369380.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/vaxubexanukov.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0124ef670b82dc13920811580abf1ffd/xetirofibojesij.pdf
    • https://amatnieks.com/pictures/image/debusonagebeduto.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbac10d9c5---bezok.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b18cf7134b104cd0bee1360471bbaff6/28779994350.pdf
    • http://kmkonsult.cz/userfiles/file/numefememewedadofa.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/zawelipetijeson.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=genetic+variations+in+natural+populations+develop+due+to
    • 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_off000107f8.bin
9fb6fc55cf01ad6f8f173171e33f80ccdb4c34ee13c25f2ba4b34722f35b8542
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 10712 bytes
font_01_sfnt_off000120c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
font_02_sfnt_off000138d4.bin
1da9683873552f5dae233b9dac4401e51680a71debb43aef8a2050dc0d1ffc14
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16740 bytes