PDF malware analysis — malicious · 4ff6369f7ce3681a

MALICIOUS

PDF

83.8 KB Created: 2021-07-20 23:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 486c4d3eea5f6062a6faf912fee08b6e SHA-1: 6cec0712fd26638e39f7b5d80994dfef395a5daa SHA-256: 4ff6369f7ce3681a2d36736f4d3cee749c957c817576f905b8a73d3a011d19fc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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.
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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/1bff2db916d7079ddb5c7065b9059f2e/81768567525.pdf In PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4a43462aa0ea20ff4b102b8ab7f5c282/wepejijex.pdfIn PDF document text
- http://3xlove.com/uploadfile/file/logijudadotasivar.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/95e4b7f6fa5987249ad65c5e2907a6ea/mivigujezijulapugodomiw.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mota150bv4idbr5ema9k8bi7bq/wunuxekerejutunivuduganep.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13113cf9eb---tebete.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf766eb4510---19924715724.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeb187085---puropugezaginad.pdfIn PDF document text
- https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/61613b767a0ac70c46db0d2d94ea4b06/94001074056.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/83pr2vnhrjj8t3g14mjcjucu7u/piruwo.pdfIn PDF document text
- https://alrukn.co/userfiles/files/82004182937.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cda39ba4d89642bdaa9631a2278990a5/nitabijikutatupute.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608db36950c9e---zemerupilug.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9frd8gpuckq3kn6g8sqqucukc7/sujav.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb979d2bfe---matadisafe.pdfIn PDF document text
- https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/88fb3c5f7190123d8ea55050ae82ba0b/5025155386.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/78727617750.pdfIn PDF document text
- http://cukorbetegshop.hu/files/17977898684.pdfIn PDF document text
- https://zemiigori.com/uploads/file/mezubatujosulekejalufamo.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dfb6da8f5---fewabeguk.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/afa4h922bdfduo97e67sfm43s2/5592774000.pdfIn PDF document text
- http://fedoro.ru/upload/file/7660682302.pdfIn PDF document text
- https://ngusacdon.com/upload/files/92782858157.pdfIn PDF document text
- https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/2e2407fa410991f9b38d0c291415afee/matelilokujikikojigot.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=going+back+to+homePDF 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_off0000e2bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fad6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAD6	10632 bytes
SHA-256: `98bd2f1e1ac7d5eecd19ddc88c7238d97fdfc6013be3c01d4a91fe7a6c127628`
`font_02_sfnt_off0001130e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1130E	18124 bytes
SHA-256: `221ac6da6a4f8eed75ecda98c440ffeb0ecb0a80a56ad87847cb2f591e14f555`

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