Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e12756d20373302…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 01:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b5e76922fd6cd7000a70af3eb90a0c22 SHA-1: f32aeb600c7d6ddac1c393094097012139a8af8b SHA-256: 3e12756d20373302bc924f32289879d7f4c3d08ff6d120d7dcea52c2a60486da
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=being+proud+of+someone PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b333a4980---83681014462.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7kbiok4frnruc821e2uvkbimn3/xagavepenobemajujakak.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202162104544.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5iqm5knduc6276lvshnh7et585/73115946085.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/80035843250.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/73773c59ab26447a28ff5a2bee2e974e/gekawonemu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/37280143612.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dubujoxotoxewuseli.pdfIn PDF document text
    • http://charivne.info/images/file/95069586368.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/11256907370.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae93e8fd8---loguzopar.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/sigenokunabe.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/bogarub.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/32201856642.pdfIn PDF document text
    • http://hkacca.com/userfiles/17828996153.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080e16ac3945---fajojilubexezegot.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3ad2445f---foziler.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/sofaxaxamodajuvupaw.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/7138894619.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/24802048911.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333256bf29---rebozimuzilebolilagow.pdfIn PDF document text
    • http://hydrem.ru/images/file/51155365146.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160983947b1f8c---33635628172.pdfIn PDF document text
    • 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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 10688 bytes
SHA-256: 20b7e896526bdb89ece970a92634f6c406e596329716be8d79c7491bd1d8c90f
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16604 bytes
SHA-256: bcf3a73810337be70995799203bbac546426ff49370ad3a9bba74cf88700fe91

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