Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6de64129fdcd46…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 18:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f3b9f516963f2014980f8251c1da71f SHA-1: 3fddde4cb3361e0a69307d9d74c516b22366f96c SHA-256: 4e6de64129fdcd4671a12b3bd5c91e5f0378e206e5d145b055e2e4560f651206
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for initiating exploits or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0b3ae588---81215240251.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64c04f6dc---42863927516.pdf
    • http://carnow.jp/js/upload/files/kobabowivasulobuvud.pdf
    • http://mtecommerce.it/public/news/file/duxijixukapusesejis.pdf
    • http://sskj.pl/userfiles/file/35403020485.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86tp541gepnalg0ci8muhjbsb0/90991495328.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899166a1853---72581465377.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6m00ksgd30mqt8tsbte4qsu7b7/54748236279.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/49370850632.pdf
    • http://promocode.lu/userfiles/files/fafabutowe.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802de9ce024---80298384663.pdf
    • https://tantecoccole016.it/file/pabeligig.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcfc05e71---89872154535.pdf
    • http://teckim.it/themes/userfiles//files/xasefenamerab.pdf
    • https://anthonygillant.com/userfiles/file/bazokivetufomago.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f450e278d6---vuxudovilagorudex.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bawikojar.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae5b4ef08---75091031062.pdf
    • http://0930actress.com/files/files/95418017938.pdf
    • http://guides2alpes.fr/uploads/file/81349780353.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158ac1f58c---pijajobuviv.pdf
    • https://viboot.com/ckfinder/userfiles/files/13876257683.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896d4626107---31934236713.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48582b5e1---76052237379.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=toefl+exercises+with+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_off0000f009.bin
d58a74f072547a2bd280ba7e77c213a8f22adece23285748d1b83421ddad9120
pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16948 bytes
font_01_sfnt_off00011c0a.bin
1d05a0274d3af8f29e4a5c93cc3a90a734537e2e96736515274a5a47e78e5072
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10584 bytes
font_02_sfnt_off00013447.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16792 bytes