PDF malware analysis — malicious · e810484e5e7ec48d

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 05:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 80607c4af9b51e6bdb51d23c8142f9ae SHA-1: 0cd81b464dd13f88fa95cef79526f9f2d4ed5c58 SHA-256: e810484e5e7ec48d9c2b6baa1e8516c1ccf5065a826f0190befcb49a433f5440

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting domains, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, including those hosted on compromised CMS platforms, supports this assessment. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 5

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://renhedc.com/uploads/files/202109201125581809.pdf In PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7941232261b46b2013027244289c870d/momovoli.pdfIn PDF document text
- http://scarpatti.com/files/84643529101.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/18h14o9uaa6morcgd763a011t3/701770825.pdfIn PDF document text
- http://risme.vn/files/kuvubu.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a53846ec251120147fbec930a8025f5c/79686529310.pdfIn PDF document text
- http://cieplej.pl/imgturysta/file/6552603813.pdfIn PDF document text
- http://uniontsg96.ru/admin/ckfinder/userfiles/files/vikuwagili.pdfIn PDF document text
- http://bernardthevenet.fr/ckfinder/userfiles/files/bubavorizidafokikef.pdfIn PDF document text
- http://gioiacompany.net/images/upload/file/95442912984.pdfIn PDF document text
- http://carszana.com/image/upload/File/25535575331.pdfIn PDF document text
- https://websbag.com/uploads/files/durisujoxozisolipe.pdfIn PDF document text
- https://www.highlandernepal.com/assets/ckfinder/userfiles/files/90491544419.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1498e1e5---wiwosomevejesapowurosulo.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613548e399f31---77055338211.pdfIn PDF document text
- http://revucue.com/ckfinder/userfiles/files/53742641564.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/87950697371.pdfIn PDF document text
- http://virtualcharityevents.com/vce_cake/files/files/jagetalanik.pdfIn PDF document text
- http://mybed.tw/uploads/files/202109140251178235.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/votorizi.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/sexonivizuritilud.pdfIn PDF document text
- https://needlugs.com/userfiles/files/fonazek.pdfIn PDF document text
- http://cameranichietsu.com/luutru/files/wavesewafanodaginasamujab.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/fekaninilawodupefiradipet.pdfIn PDF document text
- https://thietbigas.net/media/files/89220106222.pdfIn PDF document text
- http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitunusugap.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=galaxy+store+app+download+apkPDF 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_off0000e9d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101E9	20548 bytes
SHA-256: `5fdfaf96b3500d4d71a6f9c74146b22b568f194bdfcb9130403a5b27e8e460da`
`font_02_sfnt_off000137e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137E0	10724 bytes
SHA-256: `61c0cc2d11ef78f59934067dd01ee9233c17b3caae18b15a024acb5d7d23ddf3`

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