Malicious PDF — malware analysis report

Static analysis result for SHA-256 d342da3a565969b3…

MALICIOUS

PDF

528.7 KB Created: 2021-06-27 12:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e0a5f7bed58a212bdea801af76b327 SHA-1: 190d97e0555a6702b379e66dbbe35b92306113bb SHA-256: d342da3a565969b383c9457eed09df151e88bb2a5e172f5770ca442d1d0f28ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7479

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5gg7ccg1uv1oq6j602fhfbdvlb/lejinuraj.pdf
    • http://rubensova16.cz/files/file/88527989471.pdf
    • http://albino-pitti.com/pub_img/file/wevanixuvek.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e0cba6b0575c56a6cce7a9a2d742d723/wilimukif.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d5caa8e783995de32a950ca811317d2a/81297973290.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6bc34639---10330976168.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b21b786e---masesufudowubenarefib.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609df21cd0c17---90487752213.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/24612a56aec4118b762a410a96e88af3/46532132091.pdf
    • http://elitvorota.ru/f/file/bepulimavawatomof.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/81789425655.pdf
    • http://lyjclinic.com/ckupload/files/2637128989.pdf
    • http://omgmediatank.com/userfiles/files/97424269016.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda092ac02---82954297717.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/908afefbf769dbd8abc0c07eb25066e6/gojizawalezenixufozoxu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/406fcdb9acebeea6418281a67ccdb467/seniwajivavusosag.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/403a923e6c7693cbee81c2296ac2056d/kamusukozorimapazixis.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/23181941422.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618ce56069---89741838133.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071772f7e2e0---dojaxiwaligoro.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/5707520763.pdf
    • http://asokmontridental.com/userfiles/file/28109696533.pdf
    • http://tunglamgarden.com/images/fck/file/95739950037.pdf
    • https://alianzatours.com/imagenes/file/11270564977.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27432861f---78361212147.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6a701097---vixevopi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+course+in+modern+english+lexicology
    • 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_off0007b98f.bin
46f37786eed717e9216a1b9a44e4f404e5f927a36f426394e61ea2951751bf79
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B98F 29188 bytes
font_01_sfnt_off000801a3.bin
3760653173fa9d1a829ed6aebfa856d701c0619333c2e7525391945ae2391893
pdf-font-stream PDF embedded font (sfnt) at offset 0x801A3 10856 bytes
font_02_sfnt_off00081a47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x81A47 16792 bytes