Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5505b4af203187…

MALICIOUS

PDF

75.3 KB Created: 2021-07-03 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef73a65f52a5287c392b694d148368ec SHA-1: 4f5b80cdf59202d4f0bd12d50f07dfb81456730f SHA-256: 4c5505b4af203187dd86dd0c4f44fdaf6d4d873add4fc6811a83c986a01fab91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f94a94d9a39446d6063e99e893558551/5750606240.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/riuv1ne96mkn0rmmlaejfcquv7/zunoginowimezimugosamulip.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0fc14da778299a440dec4d8da1a8443f/budak.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3d433e835d0c13d2e5ae96452b1cadb7/negav.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a6abe3e08716136ae08cc996d67e7b48/dikapafodesupitukogos.pdf
    • http://royalwedding.jp/images/blog//file/31539135149.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t7qqco53c2j650qfeapu16ern6/55834793043.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072391250290---lurogaxat.pdf
    • https://ketdoanbus.com/webroot/img/files/xinadefitewolalomuv.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d6f69b698443743998771c323dfa5bb2/gaxowusufibuzoneno.pdf
    • https://atamergranit.com/userfiles/file/50398496606.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc839e4902---92056530010.pdf
    • http://www.zywawiara.pl/pliki/dikila.pdf
    • http://beiwendq.com//data/attachment/file/sogenenavil.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9b371750---9252141944.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160786e06ccf52---73993934616.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d40c8e4cf---ririnitebipemokefis.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e5c884b47d08697408ad361b565f7157/7842865142.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0iiamvmkttdoq6g92bbd2mbvli/jozirelofixokojodoxubog.pdf
    • http://autoscuolauniversale.it/userfiles/files/37132717420.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e4e78ef0---nojukawizerebubipinid.pdf
    • http://activesolutionelectric.com/images/file/silazofuxakedagegarurex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pathways+book+answers
    • http://e1pl2.nazwa.pl/busy/fotki/file/12419422801.pdf
    • 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_off0000c272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC272 16792 bytes
font_01_sfnt_off0000da89.bin
7083499872d1e073fd7691998ada61c2bcc02f9f3de7cd8fb2a5e8a761d46150
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10500 bytes
font_02_sfnt_off0000f27f.bin
5d8f2317a35b3291d94a17dbc5326effaa48ab160efd605ac6191c47242676b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 17068 bytes