Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b16ab73c10f1e2f…

MALICIOUS

PDF

226.4 KB Created: 2021-08-01 00:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95df0ea4aa8c36749ec7f9320f674e3b SHA-1: 4142dcf518203e0c9716ac8b52ac7d61cfa71641 SHA-256: 6b16ab73c10f1e2fe06f7370f1d8ff5bd402cdad9ae3c9fbee392c017feabe06
134 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8603

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.
  • 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 https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c54521f2c---99206613705.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j8pdrijkodnfofsv1ducann4r5/doxugiwefosupelapelus.pdf
    • https://vpntraffic.com/upload/files/87797385668.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wobegasawuvoran.pdf
    • http://mackyz7automotive.com/js/upload/files/vubapojolozedu.pdf
    • http://olech-rzeszow.pl/userfiles/file/vamefogizemef.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/84535925513.pdf
    • http://runo34.ru/attachments/file/93556382095.pdf
    • https://chiuman-hk.com/images/file/37769760355.pdf
    • http://lumieretvie.com/userfiles/file/23914535283.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c28a8a957---lofelugavigugupekufosiwum.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/58614683474.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/96992847052.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b410e8adf6---17892575727.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/22944718072.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303d80e1a6---14867619956.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dbcfc031710b8f92a46659a1bade7d99/vetakopumo.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5bf23b37a---88873765193.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdfe4c505d---24913345205.pdf
    • https://hoya.hr/UserFiles/file/xiriveforotujumilorido.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/poe4kl7s1q5qstst701jm8vpp2/petavipadobuja.pdf
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/5432113100.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/33257057211.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5273ee106---88238787578.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dcc40d03ac3ef7ed0c0e1a8a1c7fd7cf/24088674237.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=el+diablo+de+los+n%C3%BAmeros+resumen+capitulo+1
    • 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_off00031796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x31796 16792 bytes
font_01_sfnt_off00032fad.bin
3ba9cc6574aedcba8118961270e87212e3e5339b5288132b0b7434557709e0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x32FAD 11068 bytes
font_02_sfnt_off000348fd.bin
ca5e71132ab3cc037030353c2b41c4b1af0d2eeed7fb7adf5aecbf1ab715183b
pdf-font-stream PDF embedded font (sfnt) at offset 0x348FD 18148 bytes