PDF malware analysis — malicious · 838db91a596b2c87

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 05:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5a8896b38f23872dfc5ecff74036b621 SHA-1: e6862716f2e5400ac5dc1ccae39ca4b23902b1a7 SHA-256: 838db91a596b2c879b3e7dfa0c0efd4fb7cf363dad931f02ef01afed26de78dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are designed to lead users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d65196a30e9---ruzotetogajojana.pdf In PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/687d490f3f8d1e2a05eff8086136b95f/34449935121.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/62bb70ccacd61d3af9fe9b417ba23ada/17948332474.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/26ppddmk9157j9fjfh0g12f1m3/bemazominaxezivamivo.pdfIn PDF document text
- http://divorce-difficile.fr/userfiles/file/nixetizuxokeserul.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/52736316325.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/937e992ee83bb6b4b2d21ad8359aef0f/6619483332.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b5c942499---71340642021.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/01051030952.pdfIn PDF document text
- https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/d24e1c083ab6506638f8392e960d0836/45617263204.pdfIn PDF document text
- https://telenovella-bg.com/files/pasotitopunupekiz.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e37d27ddd5ccb80b07386c929712ed/pixal.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb4dafd5a---tipififoduwuninofere.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf64e78dab---kavejom.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f8571545---rebitiri.pdfIn PDF document text
- http://scamps.biz/userfiles/file/muzamakanaxunarupusit.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/26778269641.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/30419157899.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8eaa34ff7463a9c379113a60a1cf87fb/legarelanuzo.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9516c0b13---xovajuzog.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8934fe93ccd1a59e042233073ad0a0e/retutevomuju.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l15eggd349bu2pk4t5ans2uo99/31138781066.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db312b1ab4a---4910728271.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/43bd205f4b0b38aed7814f0acaef2617/28888921396.pdfIn PDF document text
- http://yi-xiang-yuan.com/CKEdit/upload/files/wanaminajuxegofufivan.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f585dceec2---39946439451.pdfIn PDF document text
- https://tidurmalam.com/contents//files/96968760026.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=percy+jackson+and+the+lightning+thief+audiobook+freePDF 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_off0000f723.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF723	11332 bytes
SHA-256: `e19f639798cf40d8201feb46b871a6ca72e879befac0971de602bbb6c9808350`
`font_01_sfnt_off00011187.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11187	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12999	16552 bytes
SHA-256: `99c1fa9fa4ecf40a3ec8973f9c52e2bb87779d76a87e90225620bd0ee19d472b`

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