Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce6ba706d283306…

MALICIOUS

PDF

238.7 KB Created: 2021-06-28 16:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27eeea7dba8d38742aed0f441c394e82 SHA-1: ac83470024e8b94c8c77673c9435b51daa9e138b SHA-256: 9ce6ba706d2833063d33735d18760e94714c79a39519bfa386b54cbae52a492e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute code. The PDF also contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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://infrive.ru/uplcv?utm_term=north+of+the+border+wiscasset+maine
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3cfccf6b---95775828793.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4t5b5lden0617m04h15sk1tsq3/59883002623.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb96b67d56e---wetisoxuzutitozolut.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/49090f7f03d48a205bbfdc0dbbbe99c3/47999248759.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/23064133015.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/59b32a8eeb416df8f4258510d66206d4/88948083605.pdf
    • http://unsersohn.ch/images/file/perokefo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ba58d60d---7832118393.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/84128036142.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fe4f3857fa96fa4e444c8872d191c7e9/29773109529.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0b4238ef43a611976c6ed76d8364d70a/pogitasoxezerunotelotew.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d20e75984c2---jisaduwedid.pdf
    • http://stardentalcare.org/userfiles/file/nafuxobimelibewelovef.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ae7a4901---walafobedozem.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c742de4915---38117050977.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1553ec3d---72338800040.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e8810968---zutagurawewopur.pdf
    • http://yomamasushitogo.com/uploads/files/jokof.pdf
    • http://motoren-adachi.com/js/upload/files/89837403594.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe13dbac8---27016385540.pdf
    • https://nguyenthelong.net/userfiles/files/88515880060.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a8f741d5e---rades.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/74622983054.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/nigupex.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030bf6.bin
d253c2dfded7d7eff2d3d91672441e6601e25567bb805fe6b97e12dad3417933
pdf-font-stream PDF embedded font (sfnt) at offset 0x30BF6 11620 bytes
font_01_sfnt_off00032eae.bin
ed46202649919385a44fdaceaee6b1787db57e42e048e0ff9a8147395a4ade0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x32EAE 21368 bytes
font_02_sfnt_off0003659d.bin
baac18e3908d2610b8696171ff0bba7ca6e0b083dbc82f2bac698c64e873c253
pdf-font-stream PDF embedded font (sfnt) at offset 0x3659D 10900 bytes
font_03_sfnt_off00037eb8.bin
a493cf14d42598d256b41302b6b737aafa7e6b0f151a2977567a5726682abbae
pdf-font-stream PDF embedded font (sfnt) at offset 0x37EB8 16112 bytes
font_04_sfnt_off0003940d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3940D 16792 bytes