PDF malware analysis — malicious · 467986837877d2f1

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 08:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: a720b2b789c862e4ac7e1abd397856be SHA-1: 9a386f9d4f0eae442d752b3c87276634e129bcb9 SHA-256: 467986837877d2f16d936e078152433b77c2741dddc53acc31bd29aa83840587

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure, redirecting users to phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://smidgel.ru/uplcv?utm_term=read+the+rubric+and+answer+the+questions PDF link annotation
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d68f19c4---20388638707.pdfIn PDF document text
- http://dralituncer.net/userfiles/file/jafabuduwudilise.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47539c8ad---jatuwazawewunes.pdfIn PDF document text
- http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/majasidasuvukawojodij.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079034348f1a---10035301419.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2d404749---biduguv.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5817ac37b5---gomegegedawapezisokew.pdfIn PDF document text
- http://machinegroup.ru/img/outer/files/nokutafiwe.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1c1ce5bfb---fufezazubokibezobomo.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ff02606a---58569725671.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cac6949b0d619fe375ab2da3444b699f/16050120071.pdfIn PDF document text
- http://architettorobertafasola.eu/userfiles/files/70287361967.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hokr629j4epnt9b64mb6rteo06/buxomezomitesijotupofen.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/zasuga.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/pejedijugadiko.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f83e15aa8---gatobedogizedepurusixegas.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9e65f01817d35b91b02b58bec22a3b55/5814615897.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7709a508ad---38499944486.pdfIn PDF document text
- http://1137.jp/app/webroot/js/ckfinder/userfiles/files/85468991557.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8ecipv0upn4idlmtmjrvt1emk6/8668632731.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kphd402qnt13ku49cgog9dqs5s/15589897822.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a376f7ed96a---javugubejemiwijoraborap.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2904601b93---2872808885.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2947dbc608---kizaf.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_off0000e837.bin` `cb826e19d48aca672ff5c3656a0e4cf952d230178eaab050a9207417798c03ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE837	16540 bytes
`font_01_sfnt_off0001134c.bin` `b909deb73ff366c9eb9f322d9e586f9abb10a8e008e11bcb541211af351a7bee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1134C	10940 bytes
`font_02_sfnt_off00012c72.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C72	16792 bytes

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