Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e56c3f59b840f5d…

MALICIOUS

PDF

81.4 KB Created: 2021-07-22 23:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e1ee3c27374bb2d07627adb0401d90 SHA-1: 0ad910a7a19282431693926b36a2620974859dc9 SHA-256: 1e56c3f59b840f5d416ea5b42e1185ea176cb17df55364185f8344a8da334522
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e3155f4fee93e4e1854e07703cbabc31/siviresubepogosalowiro.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce4a417d7---91826169053.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/dmc0ppif4rts8fka7bjhd9iae5/kewatuzawu.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/43455661539.pdf
    • http://thevenetianmask.com/clients/71561/File/xitusigakodareza.pdf
    • http://xboxheerlen.nl/userfiles/file/muxepomujexilowazeverup.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a45bc2e3273---mipeme.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/44579178666.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6efbee553c---diterorawovafituguzukedaw.pdf
    • http://salt17.com/userfiles/files/savefativexe.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8340c98b404d066e3894938b7de5bdff/sutabevedidejazanoj.pdf
    • http://berbun.com/user_img/file/37732672573.pdf
    • http://evola.it/userfiles/files/85616749551.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/01b8fe480bcee9955c06ba57940e8072/dugewogido.pdf
    • https://wegofa.com/userfiles/file/11936164612.pdf
    • http://musorcentrum.hu/files/article/file/98096802570.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a025e9d3---19290109467.pdf
    • http://aelma.com/sites/default/userfiles/file/92902474770.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec73fee6c9---fekotoxelow.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/67edb7d3b6b8ccb5c2cc19c682ccb88b/lujonomatitafaru.pdf
    • https://keluargamimpi2.com/contents//files/baluwapagusezunadofu.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/1781501664.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/672ba33f35f9adf3e85cdfe1e47601c9/16160695045.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=concentration+percent+by+mass+worksheet+answers
    • 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_off0000d961.bin
52d28403ca78e0bb500f49aba1a883b75693ec759bc6686f5af047e9fdcf9024
pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 16792 bytes
font_01_sfnt_off00010569.bin
4526a5f760fc7e551f9dcd389f4f5fec917fa78602d4387bc665c5c9a5df3a40
pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11056 bytes
font_02_sfnt_off00011edd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes