Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdeb9be599c18bc…

MALICIOUS

PDF

98.2 KB Created: 2021-06-26 19:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2005a8e0f4cfb491319f2fc2ac5a114 SHA-1: 5931123f99e07ab2a5d39ccf713aa976957d36d9 SHA-256: 6bdeb9be599c18bcdb093997c53e61083fea1cab415a9bdf2186728cddf444b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/nusewej.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b1253ec06c2b58d2a7b2658072996b56/nopivedalawozexodigevimib.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/ratawaxumuxexivuzajobaw.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2d1f73dc4b5929f1fc99aefe59195762/57632643470.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/3508628044.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3bddcfa7a2b8718cae4adfd8673bd057/bubomejetikonoze.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929ec03a2db---vasiravitowu.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/a8079v9tre9gjnavbg68eqah2q/2982182950.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bc03cdd0c6c1f489105bff4ec8cdb9b/2394983406.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48917fd38---23607594126.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f9b07528fa9d904f5fb3b3737eab5ef3/86276226220.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c4081ee6---vudekalonavoxiwerebu.pdf
    • http://eros-arena.de/eros/userfiles/file/fuzavutinonusizug.pdf
    • http://www.jindatunnel.com/up_files/file/95192150712.pdf
    • http://mousike.it/img_ins/files/minupireti.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/96215849432.pdf
    • http://matsonconstruction.net/userfiles/file/30845644608.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e83efa4ef525807985c49270918d5289/46575511111.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e549be98b6892b7a7bcd93dfcfd2d656/miwekufegogivodonul.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/kadulemesotukawariwifi.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/42116028027.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff86d61a92---33573278320.pdf
    • http://apcmagon.com/userfiles/81135803816.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6cb4dd5df38dbbeb60c0f439627d1588/85486149179.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbabfbd44b---71024562537.pdf
    • http://maihome.hu/admin1/file/46089896006.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608743a23a234---depugow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=all+fortnite+skins+and+prices
    • 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_off000118cb.bin
704b9987fe0f6d4ec8d35b0f83a4a95f8687e15965b862ea2306b1d664199261
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 18772 bytes
font_01_sfnt_off00014a7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 16792 bytes
font_02_sfnt_off00016293.bin
22364a38ac21d496ffd8dea6fe9185952df5a44e244c352b18691e08773f6726
pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 10684 bytes