PDF malware analysis — malicious · 1e560ea73e17f78c

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d0e2d019d910f3e9d9a67b422ef2c706 SHA-1: b5b51f2f3a6d28456710ea8bdeebf6d5acd31fad SHA-256: 1e560ea73e17f78cede9c6a2b88434242c42d05e5fb4e6fb5aa3dc3305673fd0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://docando.es/js/ckfinder/userfiles/files/xejogatukuzaganudili.pdf In PDF document text
- http://northcity.rs/slike/files/41547659012.pdfIn PDF document text
- https://drddvichitra.com/userfiles/file/35720907186.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087327f9c222---3871151638.pdfIn PDF document text
- http://blevy.com/ckfinder/userfiles/files/8852179116.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607432545f190---90780558988.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4049a4fc---44244227931.pdfIn PDF document text
- http://blessingsngo.in/userfiles/files/1538574386.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2d141629---vezunazol.pdfIn PDF document text
- http://currycornersugarland.com/admin/images/file/37139286235.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886691715fd---fubonujus.pdfIn PDF document text
- http://sgpeo.pl/users//file/futulafuxojazalufuta.pdfIn PDF document text
- http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/21553546001.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dipr29t6o9923ggqt4ipmvaej2/jugupiwixus.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5395dd35---44945526821.pdfIn PDF document text
- http://www.injamal.es/nueva/ckfinder/userfiles/files/xijiragokipiduw.pdfIn PDF document text
- http://jingchengs.com/jingchengs/ckfinder/files/20210703072825.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1edfac3dc2---66063860666.pdfIn PDF document text
- http://ufcnagykanizsa.hu/userfiles/file/76260502618.pdfIn PDF document text
- http://prtourusa.com/FileData/ckfinder/files/20210728_CA707807A0513C1C.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/60783551382.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tfjjfc5jbjf2jtkn0hpeui64c3/korimewemotumuwume.pdfIn PDF document text
- https://tl-systems.hu/files/files/2074958898.pdfIn PDF document text
- http://studioaeditecne.it/userfiles/file/66395513737.pdfIn PDF document text
- http://harlit.com/upfiles/file/gefulawimurekupawote.pdfIn PDF document text
- https://tybistanbul.org/resimler/files/jozadivopobafov.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=economic+book+of+class+10+ncert+pdfPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c18b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC18B	11168 bytes
SHA-256: `943b05015c97c7e4ea10cbf8000c6c9d534796cb69f0075a2eedaab65d101a54`
`font_01_sfnt_off0000db6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB6B	16876 bytes
SHA-256: `a443646818817c358264aa99c7a96754d92856b321c8a8f99a486131811d167b`
`font_02_sfnt_off000106fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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