Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78dc70d46db87fb…

MALICIOUS

PDF

67.4 KB Created: 2021-09-17 13:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28241fcf45534cffe13ca3e58431428d SHA-1: 0edcb4ce937e2732103cf63f8cd8ab9bec22c945 SHA-256: c78dc70d46db87fb91d3096c51aeceea240284fa44bcb59b784337fab28db4fa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

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.
  • 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
  • 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://cbcom.fr/ressource/site-image/files/zavabubijinomi.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ud8n833r5k2mn67id8c8gg5lt5/3611779330.pdf
    • http://assytekservizi.com/userfiles/files/fekagewonavufipexuwavezi.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424ba4c09e2---96727556347.pdf
    • http://www.hgbehringer.de/img/files/files/74594230041.pdf
    • http://prestopc.it/upload/file/begalezujugivafusas.pdf
    • http://ideatity.com/ckfinder/userfiles/files/loregotogosepa.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de7e6e5dd---zivevugemivozuled.pdf
    • https://hkparkkonutlari.com/image/files/zenufaj.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/82921165052.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/bejufagifusoxalogajeg.pdf
    • http://gloteckr.com/upload/editor/file/teguzepolelediroze.pdf
    • https://bak.vn/upload/files/13992380923.pdf
    • http://designklasse.de/ckfinder/userfiles/files/mamisasoz.pdf
    • http://lasermedia.cn/userfiles/file/40742750011.pdf
    • https://immobiliareincentro.it/allegati/file/gukapavip.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wonomepisaruziwutovitogod.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614420d699d56---juvanazedekepo.pdf
    • http://herve-coiffure.ci/files/zeretamosopofalaxomo.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/viwovasib.pdf
    • https://kuzeyilac.com/resimler/files/popekubaredujizibu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nfs+most+wanted+2020+apk
    • 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_off0000b602.bin
30d8131c659968b8fd2df649ae5f450936a76b5489feb31dbb616fe77de12d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 16088 bytes
font_01_sfnt_off0000de68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
font_02_sfnt_off0000f67f.bin
02614880feed9c9226099d575e29a76d82d69719437fa1755ee2a68c03149372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10816 bytes

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