Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b13dc0ad9b45ea…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 03:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c49be23884aa02d3b97bc885df8ae07c SHA-1: 3dc90264360fcbe31f16a8809e5c2ca72985b99b SHA-256: e3b13dc0ad9b45ea9eb48816ec67e2337a40fdcca0b0df98be67160cbbb72d77
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drrajanmahtani.com/userfiles/files/73266770473.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/57c107883490066bbd471603360aa457/71299607866.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59003632342.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/rodun.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8a84d488---12727163587.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/dafusakugomuf.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/ludeboza.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/14816301968.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/5623441373.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/83961676462.pdfIn PDF document text
    • http://planetamama.ru/files/file/42909172667.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/xesek.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/tuxirujujaxe.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/67446740778.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/12589907103.pdfIn PDF document text
    • https://proxus.nl/file/vivukovukovimegax.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tazivodaw.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6f3c82ee---gakezov.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/welobomewasijasawiwiwugu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/80479663747.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/65482757156.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sanomasum.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/87407832919.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130938288386---63968567889.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436dd399a97---nufejavawisufetex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=god+of+war+1+game+download+for+androidPDF link annotation
    • 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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 14976 bytes
SHA-256: 44b03452d11f9aac2923a8894c78f8c6e952b532f1c8ad8fa4bef62803529871
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10608 bytes
SHA-256: c0a9edd3dd5e71418c219cecf335c0bcd207a92cbef3f03373b1832011718a8a
font_02_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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