MALICIOUS
156
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious Link
The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, specifically mentioning 'roblox apk update 2021'. Several heuristics indicate the use of compromised CMS uploads and disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.
Machine Learning
- Nyx PDF Classifier malicious score 0.9975
Heuristics 6
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ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARMPDF 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.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://krisoc.ru/uplcv?utm_term=roblox+apk+update+2021
- https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vonidibapikazo.pdf
- https://protectname.xyz/whoisprivacy/userfiles/files/wawunij.pdf
- http://twapp.freshkon.com/upload/files/gebewejojavobaz.pdf
- http://carbonelite.ru/file/jofevaguxakanaludeban.pdf
- http://samurairamenbar.com/uploads/files/81735181135.pdf
- http://studioguatta.it/userfiles/files/84393625332.pdf
- https://fultoys.com/userfiles/rerarikotopitu.pdf
- https://cambodiadriverservice.com/userfiles/file/jovogufonuwamuge.pdf
- http://sensi-leszno.pl/userfiles/file/57449433668.pdf
- https://laatuwhuisweerstralen.nl/upload/file/welozazuruwo.pdf
- https://lostfoundglobal.com/userfiles/file/3355904966.pdf
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d135518dd2---teres.pdf
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3162c2cdabd6a312b57e0fcf2378f5dd/59735708786.pdf
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/55409cb1fe55cbdadbd97c13397d6b6f/luripewop.pdf
- http://ecohouse-lab.de/userfiles/file/miretifitegesoveb.pdf
- https://novahealthclinic.ca/userfiles/file/90272463027.pdf
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427dfa159dc---tizumutajulexaxerawuk.pdf
- https://khyatiinfotech.biz/ckfinder/userfiles/files/58571216835.pdf
- http://angel-conference.org/upload_fck/file/2021-9-2/20210902040111427520.pdf
- http://4bzsoftware.com/Images_upload/files/56495266197.pdf
- https://deshpanday.com/ckfinder/userfiles/files/69109100065.pdf
- http://marinda.ru/pics/images/file/mobodapiwim.pdf
- http://esangsok.com/upfile/files/60976663362.pdf
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5d6790ba0f6d825b86a5d95bf4275aa5/9028234173.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off0000b23c.bind50775c79adf50a3eb9da867041cb9510ff9bcd7cb73203a48bd8f23ff313caf |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xB23C | 14568 bytes |
font_01_sfnt_off0000d691.bin9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xD691 | 16792 bytes |
font_02_sfnt_off0000eea8.bin62c462bc356ba5866fd4cb39c867339a132eca85f96b076d214b8524969a6d4c |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xEEA8 | 10692 bytes |
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