Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4b55b023f8b3fa…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 10:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6af23e7542c8072af7b1932fc3e39eb9 SHA-1: b6677d03cd27cfe79bb79dedf48e314d0b32946c SHA-256: bf4b55b023f8b3fa647924404a0bac2f388f5649dd2ab375ce68333c06156387
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983d2a12305---fiseloxuzonuxitobugek.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092033813aee---didalevelixifisiwitu.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jjt8gaj8ghri9as13jtsqu5ag0/nerub.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dlskjuqadkuktpkl832pbu8o57/34042893669.pdf
    • https://bevelec.com/bevelec/dossierMois/file/jagumejimitexuxoseresanel.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844fc160d3c---xelokuwejidegomujezewuto.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abe1cf113---84393899445.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vn29lftn415vmfkqtibt3pm3uq/50138736359.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/869249b1e8292f2f180b9f9abd277948/93869712403.pdf
    • http://www.blueoak.fr/image/file/mumixevixus.pdf
    • https://noticky.net/akce/fotky/file/kunubaw.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba20c5a6e---wunawobuforaneze.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71505025ff---75644887685.pdf
    • http://j-club.eu/userfiles/file/fitanitudivagolib.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9af1a1c5---nimefobamaxokumepavezev.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d180136abc---nusipezalexikodod.pdf
    • http://fernandopelosini.it/userfiles/files/maremezizulozesa.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bitbf74au1lg8hl0a4e0bdkasp/97899455131.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/pckocdnms79gn2249vc5cl3tk3/zozopumofovaguvi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ftuqdoq8n642bqc3u7t7r9md0f/85913006535.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/44159490061.pdf
    • http://nsdadventist.org/FCKData/file/vizisebomufuginire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dungeons+and+dragons+5e+character+sheet+fillable
    • 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_off0000f095.bin
5f759f5128709747ca89c7798893153f24f83dc1e3e88a53b808602a1a64f98e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 17824 bytes
font_01_sfnt_off00011ecb.bin
1423049843cb02586d5929ceb28ae85924408e9d41499765d9fd972b538c4840
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 11132 bytes
font_02_sfnt_off00013893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 16792 bytes