PDF malware analysis — malicious · ce2a4e0dd7c223a6

MALICIOUS

PDF

76.4 KB Created: 2021-07-02 11:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: ccf1c571c5c8f1c2e1578fba726077ac SHA-1: 34c757059969a712ab847335822e596ba8e10d33 SHA-256: ce2a4e0dd7c223a6d41b332b79be563b817e39e14ef4c29922277f807457e0ce

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates an intent to execute code within the PDF, likely to facilitate further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hblue8niaonv7nbscguk0hgoo5/jexubux.pdf In PDF document text
- http://szsahsh.com/uploads/files/362332120.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c07edf020244dfb429f01f713e9df18e/xosifatexeripipofino.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pl6jmlq9ji24edjpphmaio8gok/wezokotiri.pdfIn PDF document text
- https://mfdesign.hu/files/file/likogope.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0ba72212---rawetagisikopajevagu.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9nj5n49tg9sja8l4e08dkc4os3/fipakivopegafudovizaf.pdfIn PDF document text
- http://donghocasiochinhhang.net/uploads/userfiles/file/domofeguj.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05bca75b---zesapuz.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607725e4cd485---81477789804.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/51e0a1c99509449063461650caa94c06/pulagapub.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c62ad4d167865c8b0b16a069f518282a/70923543420.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/lolafinolavagabo.pdfIn PDF document text
- https://codecs.ro/images/file/videpelurererotugejag.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb670d9696---68683069216.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed9f657ed---67297158246.pdfIn PDF document text
- https://moraure.net/js/ckfinder/userfiles/files/gumabufinoxibe.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e2238fcfb9ef21ca5df189c5a9a5d670/wigaxegawimaku.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e35df06a5cd5914c7844c2216bcbcf11/bunugaxitoz.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c72aj6k2cv5mph7o0cousgu9c2/romarilivupovu.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02362f1707---11270909561.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/28627163600.pdfIn PDF document text
- http://mariautonoleggiomarsala.it/userfiles/files/65686349816.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085715699---sijazanabosatuwezuzape.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clinton+county+probation+departmentPDF 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_off0000c847.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC847	16672 bytes
SHA-256: `1dc0c27b4d6525afee77acbde9720069a65374aa226b409e689a7041e0196104`
`font_01_sfnt_off0000f363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF363	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B7A	10892 bytes
SHA-256: `13f8a91497939370e0aae5a46e74378e75c9b4d28e2003f0e7ff30bc98d76c52`

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