PDF malware analysis — malicious · ac0a6b2fc54f3ed5

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 05:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e5752b7e3f09e19c8e9c1522c60f92d8 SHA-1: 6d5a4fadf98b847a26795a886402fb927d7be066 SHA-256: ac0a6b2fc54f3ed5eca84a465e72c59da287b91e106346936e4d3cfaa10473b0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of embedded JavaScript points to its use as a delivery mechanism for malicious code.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=stk+power+amp+pdf PDF link annotation
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1db17d15---30294466044.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb00f06a54---vizosowogopumejupixutis.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6d27f1facd31ca676989a8f8cf9c8e99/mogusiguv.pdfIn PDF document text
- http://griswoldremgmt.com/uploads/files/5656553717.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/slcuhnsl8kdfr3gtn6tdjr8qag/ledamakerutubal.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/nosepovawut.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/11960409058.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/tixilo.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10cecd33c9---mituw.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a137a334693---xiwosexosux.pdfIn PDF document text
- http://amexeuro.com/an3_Uploads/file/vumijijabisepemosolorib.pdfIn PDF document text
- https://panificioilcavaliere.it/userfiles/files/tumuzegurubid.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5554da8ae957f5bf66fd23e5f703e6d2/48141610939.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6ld1dl3atr1bf99p2usoblqevb/rebuvifugogosa.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb0cc7c72d---78049329219.pdfIn PDF document text
- https://vinatech.com/userfiles/file/88949271665.pdfIn PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36cad348b3587fd5441dc2b79b1e453c/66631402228.pdfIn PDF document text
- http://z-i-f.ru/userfiles/file/wolivomeninodejixelibuju.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4ec98d205d97f6cdb660520c6a0af882/jigobipuzafelaje.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9cb9e1ee6f28b73f92b27d972786099a/xurepukevuvamilikaw.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/5890668311.pdfIn PDF document text
- http://12shio5.com/contents//files/23854914363.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa9dbf523---46583009423.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6097614cd---31852307867.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/jofafezepegituvu.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_off0000ca4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e25d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE25D	16884 bytes
SHA-256: `687f69bbcb5068b6a9a77fb571617ae214c492f3c16bfa1704673d8e313c2da9`
`font_02_sfnt_off00010df8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DF8	10504 bytes
SHA-256: `89568c8bd91055785c0aa4781b04aa9e0550db39064944b24fb31ba11b284ba3`

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