PDF malware analysis — malicious · 16cd7fe5195db55d

MALICIOUS

PDF

100.7 KB Created: 2021-07-16 16:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 77ac8b030407542e2699129d63b20c53 SHA-1: f565e88e160dc28981f2d139f0de2bf5c1505d84 SHA-256: 16cd7fe5195db55d7b8b8dfe686297f82c8ec98fe81ac1ca8bfc746d0722719a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to external, potentially malicious, URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9803

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://rubin2000-distribuitorshop.ro/userfiles/file/98218588464.pdf In PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/kbi96r9rfso4jhjc2lf9n6kgs1/2036803946.pdfIn PDF document text
- http://metaglas.kr/userData/board/file/buravotasumufeweniwito.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac32ae6b8---36606543136.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7ccd6tjh9lf0fl7i9jttr7ogu4/9464832233.pdfIn PDF document text
- https://medtek.vn/storage/file/padukatumubatovu.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fn0ini0pqgho1pok1045tm9a6e/6063502991.pdfIn PDF document text
- http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/3226677490.pdfIn PDF document text
- https://fresh-cherries.com/ckfinder/userfiles/files/50291907765.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3d106b9f6cca95d8d3d39d9620465632/72307496957.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/45f0f0b9cffa451ed1709ca5a7105371/70440460449.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/dobobelupoka.pdfIn PDF document text
- http://3dprofi.net/images/uploads/file/vekewik.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/27815813659.pdfIn PDF document text
- http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jilukujevadakutimovufefi.pdfIn PDF document text
- http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/lamapubafe.pdfIn PDF document text
- http://kapsalonindex.nl/images/uploads/70995795238.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/42890432641.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/bd15a5db2785a962e027a9244eecd930/76233288315.pdfIn PDF document text
- https://vydavatelstvoklett.sk/userfiles/file/bibonarakisudida.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a6b974cfc---puretalava.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/967vl4pckfaj1pjista7jer7gr/xetomun.pdfIn PDF document text
- http://decaiyun.com/upload/file/2106291810124122815h71j2i4h9s8.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3f4ofug5v1vl45mh1r6ku66rp7/sutoraw.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/suxesop.pdfIn PDF document text
- https://ises.ca/phpsites/vertical_living/uploads/file/pubukimawosokekavozofor.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=independent+book+shop+near+mePDF 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_off000127f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001400a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1400A	17560 bytes
SHA-256: `dd8b3e8a8d4caaa8d8e1bebe9e504a7f36b8d0e870823fa439f6155d42de8c5c`
`font_02_sfnt_off00016d30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D30	10704 bytes
SHA-256: `f1655e6d6d7667312b1b232082d6b7fbe9be77643652ad24d7755577c98b9755`

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