PDF malware analysis — malicious · 5e3ad3e4e60610de

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 10:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 4e0611b33d49b8141ebf2f840990e08d SHA-1: 2ed82e531adcfc6d02b22ce3917cbcc523bd509c SHA-256: 5e3ad3e4e60610de7979da265f4374be04907d33c6657a9f9846c822da767244

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://yar-net.ru/userfiles/file/tetisizasiwapeporon.pdf In PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pslrqe4533990ngu92jssfpm4p/xowekurajizakiz.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0fc33003e2496b1f446e0aa90ded2de/36613177220.pdfIn PDF document text
- https://amblamy.ee/upload/file/13036493042.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867ae20fb5---wugixexivavebaxosi.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2b6cdb5f---pawuduxudezovazi.pdfIn PDF document text
- http://malifer.hu/upload/file/kodat.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a43010e34.pdfIn PDF document text
- https://northwestconvention.cz/data/files/1385207699.pdfIn PDF document text
- https://flardochform.se/userfiles/file/8405453411.pdfIn PDF document text
- http://stroisvias.ru/userfiles/file/ridobedejawosen.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/32263138296.pdfIn PDF document text
- http://avanti-kuhni.ru/upload/files/desisopajabug.pdfIn PDF document text
- http://weingut-suppan.at/files/wemaxaxexudexima.pdfIn PDF document text
- https://elektrona.cz/files/file/74442405140.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c387fbdcf78---tulanipodaxidenugep.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/471f15337247afce4b6d89f820cc92df/98638539267.pdfIn PDF document text
- http://prestopc.it/upload/file/repaparivedujato.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/1448515460.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa77f0bd---91550789139.pdfIn PDF document text
- http://scriptonica.ru/files/files/71230092650.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e802c18f3---27859374998.pdfIn PDF document text
- https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/aa6fc5fc54c56cdd772fbffeeb6a4e2b/jexuwitamezularux.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b3937baf37e94d068376e5a780cda5d5/59367073645.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e624281d68---kidilogajirupopa.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1021881e33adb197f37c2096a289c3e8/fiposobibidaxa.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/pepuzunatemamusowoguv.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+ejaculate+without+knowingPDF 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_off0000f26c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF26C	17896 bytes
SHA-256: `ea9eadacb39e27e4427b94fbbdfd1fdd780ede135f139b0739a663769676bdae`
`font_01_sfnt_off000120e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120E9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013900.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13900	10796 bytes
SHA-256: `ae8794706649c254c326457861a19f3987cc11f13a2310311b60d79a3493ad58`

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