Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d0cb205d12d394…

MALICIOUS

PDF

80.7 KB Created: 2021-08-28 22:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f4aec01b794aeb74916a381825cefe SHA-1: 3ce134b9652f015df426029dcb787efd84aaf4d7 SHA-256: c2d0cb205d12d394435c66a798a007e4b21f95c8af9d5259536ee7ffb2957dc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sanmorales.es/userfiles/files/19289749011.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9e8e89e8db40b0596427edf0e4c798bb/28865126139.pdf
    • http://belean.pl/userfiles/file/lewewetap.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/sepimugemedupitatobuluke.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f81cdb019---webule.pdf
    • http://elise.pe/images/file/38970876896.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/fesabitowepe.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb4d375f1---bukonitakunefusupure.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/55416981533.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/xosew.pdf
    • https://universal4shipping.net/userfiles/file/bixugunirunijaxigab.pdf
    • http://sentralperdana.com/file/munom.pdf
    • https://ebooksweb.net/files/file/61971758726.pdf
    • http://gold-carsales.com/js/upload/files/pulesojerugili.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2rarb37vfspd0ufkieqmgumh1n/zevuk.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/el56hu8qj8eg73gsghkssf2cnd/18120445837.pdf
    • http://short-story.ru/upload/file/tenabazabeliloxajisomo.pdf
    • https://nepalonetours.com/userfiles/files/28254237990.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e858ce6a1---65036325321.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/35927272300.pdf
    • http://china-hold.com/UploadFile/file/20210528122642042.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028ee177e0f---rulefujusevax.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/43367865555.pdf
    • http://studiocastigli.eu/userfiles/files/33406667266.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rainbow+river+state+park
    • 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_off0000d3c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 16792 bytes
font_01_sfnt_off0000ebd7.bin
978c8c653b6942e48e67ce6dacccdddbae17aadd8b63983c8bdd829a7ed53307
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 18340 bytes
font_02_sfnt_off00011bdf.bin
ad2abcb9a614713ee616d704e875d52f91ef562c6619bd5e10224015fe45421f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 10628 bytes