PDF malware analysis — malicious · bbbbc2ddae967ec7

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 00:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 18a8641ec7583ff2374ac38c92f5a30a SHA-1: 8c7021a677103129aa9ad83784813017ddacd971 SHA-256: bbbbc2ddae967ec79c7014c11044b982600d82d75655b65740744e1b38f7bfd3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly indicate that this document is designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://krisoc.ru/uplcv?utm_term=adding+and+subtracting+mixed+numbers+worksheet+with+answer+key PDF link annotation
- http://maynenkhiinverter.com/media/ftp/file/5309586648.pdfIn PDF document text
- http://e-cluny.cz/UserFiles/file/90401242935.pdfIn PDF document text
- http://noahmission.org/dataroom/file/gagajoriza.pdfIn PDF document text
- http://copingconversations.com/userfiles/file/lijadolowemax.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6c47065a1bffa14066dff7ad334617f0/49425527014.pdfIn PDF document text
- http://myredm.ru/uploads/file/muvenoperesujotejosoko.pdfIn PDF document text
- http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/60740113701.pdfIn PDF document text
- http://beiks.info/public/file/zarinekuwofagelalir.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829d2ceb4d---bigubawejasabasizifo.pdfIn PDF document text
- http://immobilier-valence-agen.com/userfiles/file/78402254473.pdfIn PDF document text
- http://saxonrt.hu/img/userfiles/files/5491960477.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6c725e0a---jolinin.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cc7b74a86---domiwor.pdfIn PDF document text
- https://italvaping.com/file/27812187184.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af49117a57---zaluzetuforozavarag.pdfIn PDF document text
- https://on-call-anatomist.org/ckfinder/userfiles/files/mugetebago.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102b395c06e4---70577541383.pdfIn PDF document text
- http://mid-europe-ex.com/images/blog//file/laxijabekuwogonujug.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c59d6a874---vebakenasigupuwonovunexi.pdfIn PDF document text
- https://sesconbs.org.br/ckfinder/userfiles/files/83422114222.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/gaduwanomaxorajaniwez.pdfIn PDF document text
- http://ckrestaurantgroup.com/ckfinder/userfiles/files/8566609840.pdfIn PDF document text
- https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/p30kegt6ss84kj5877vqs14nn7/34709000832.pdfIn PDF document text
- https://arket.io/wp-content/plugins/super-forms/uploads/php/files/o43ndm9pqbq37mftdcejkookb1/vezinegevajima.pdfIn PDF document text
- http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/vewojaxopegaxuwapisogo.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac88da5b0---xirizamumuluzapobo.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_off0000e867.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE867	11388 bytes
SHA-256: `58a37c4f1c9aad9fe03be70d73bdec6dc729d686c2dc511d739b93b251dc99c1`
`font_01_sfnt_off00010301.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10301	18100 bytes
SHA-256: `f314027a9a535d1026c9b041b6ad8aeab98b36ad0b9ce8e7ef63583e979a4947`
`font_02_sfnt_off00013186.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13186	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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