PDF malware analysis — malicious · 7603de736477b584

MALICIOUS

PDF

83.2 KB Created: 2021-08-01 12:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 77183a732a8cbe53dd9d45d142e5c36e SHA-1: 650ba2523043b61286a1e037d07f515759639f5b SHA-256: 7603de736477b584d12861b6dacec05bd9c4793a183fb6e80a1c98e0976bf074

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these elements indicates a likely phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9163

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 https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/47f60fb51cfcf49b2acd19380adef87f/87377890278.pdf In PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608005fa8184f---24646984239.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c484138d0c15b7243096d84b6d978e9f/98892639343.pdfIn PDF document text
- http://angelescare.com/userfiles/file/nexetadu.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607540872b90b---48607627677.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/zobefijix.pdfIn PDF document text
- http://bigband-ulm.de/userfiles/files/pogenelirododejalemudoj.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0bbd9cfd---68180953305.pdfIn PDF document text
- https://ceccargiurgiu.ro/userfiles/file/jaledoxatosato.pdfIn PDF document text
- http://citra.cl/userfiles/file/fawowegezokowe.pdfIn PDF document text
- http://everbeenmagnet.com/js/upfiles/files/tamanobonup.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071993065a77---96048607252.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078045e5d5d2---59365896889.pdfIn PDF document text
- http://biosite.ru/images/news/file/bivegerafenobemi.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f081eb2b2ea---61670117512.pdfIn PDF document text
- http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/11403980357.pdfIn PDF document text
- http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/85060393715.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/04613fb6ce9fedd1e5616362c08cd696/dubudefajapotadukemirum.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6dde99a2---22916847087.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/rumijagulalew.pdfIn PDF document text
- http://mpti.ru/userfiles/file/dokojodomekekekamufa.pdfIn PDF document text
- http://reutlinger.pl/userfiles/file/sogidagajifutuxirekan.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38356984caab2690516fdfb21e53647c/xulobit.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=reading+plus+level+j+answersPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010a17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A17	10776 bytes
SHA-256: `5c540223dfee08ae20ec4105a10035b0a7bfc7d5f3c3bef8d0b4bdc9265aec92`
`font_01_sfnt_off000122bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BD	17000 bytes
SHA-256: `1b2cb98fe01b84a91d4afe68e0030eb9943f1dce90253b35a22542e0363dbf58`

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