PDF malware analysis — malicious · efded07d6fe9d169

MALICIOUS

PDF

77.4 KB Created: 2021-10-09 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: ffe3af6ea907c417ce5da11f38b50d15 SHA-1: 34f067b0a8560a5a2788ac0b81d1cbc9b9cea621 SHA-256: efded07d6fe9d1694c95d95283787df06d137d2942397030347653afd4a0028d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=the+death+of+ivan PDF link annotation
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/636f5d209c031067d3220f1e99bb0a41/lomurutidedileni.pdfIn PDF document text
- http://szcftz.com/upload/31572369458.pdfIn PDF document text
- https://orig-shop-gsm.ro/ckfinder/userfiles/files/95524575121.pdfIn PDF document text
- https://virker-ikke.dk/files/rifowoloxotijazujanewo.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3a611dc99---43906366042.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebc3a8dc5---befagebe.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6a30e47d6e54840b21f4f7f277d2c865/45103168822.pdfIn PDF document text
- https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/xijutofojo.pdfIn PDF document text
- http://secondary.oksalesstore.com/uploads/assets/files/tazosoxuperazetuviz.pdfIn PDF document text
- http://reguitti-engineering.it/userfiles/files/19819144319.pdfIn PDF document text
- https://karapinarinsaat.net/userfiles/upload/file/44038459472.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9010f92---wavinelujulatiwujowate.pdfIn PDF document text
- http://camwater.org/media/files/lejenebowunisagisivuzogab.pdfIn PDF document text
- http://delannahotel.com/user_img/file/25146975676.pdfIn PDF document text
- https://vwb.mrv-educationservices.com/content_file/files/68864965512.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2dc31cf2b738abbb7f0d3abfbe1bab66/fatifujixuwi.pdfIn PDF document text
- https://dongciao.com/uploads/files/202110042218139681.pdfIn PDF document text
- http://cungcapbaoduongcuanhatban.com/upload/files/sititazifivipumudodevig.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/zegena.pdfIn PDF document text
- http://bjerkelunden.org/content/files/userfiles/file///25729665148.pdfIn PDF document text
- http://toroisg.com/public/images/files/42971834311.pdfIn PDF document text
- https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/dijimowajovelupi.pdfIn PDF document text
- https://yuktogel.com/contents/files/noxawusewa.pdfIn PDF document text
- http://budoprojekt.eu/obrazy/file/32755679838.pdfIn PDF document text
- 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_off0000ca6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e27c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27C	18612 bytes
SHA-256: `19a75c4d07f806e7495b160368b6cb6974d2f7f1c9fbf3bc279c3e45d6c9664a`
`font_02_sfnt_off000111d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D7	10164 bytes
SHA-256: `d8ae63b9e7d4ff65fa3f6b219bded5205be6409e412825eb652618728c8cba5c`

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