PDF malware analysis — malicious · 1eb6973cbc6ac22f

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 12:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e56c3dc0a51a499464469c8becdf041a SHA-1: 433fca120945dd3634a2c9eb9bed4bdf658f075f SHA-256: 1eb6973cbc6ac22f9f0225182990087cd9e6ceea56cdd884bbd25e699bad6e0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The PDF structure itself appears to be a link farm, leveraging external URIs to achieve its malicious goals.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://crysiq.ru/uplcv?utm_term=proline+uk+dvr+user+manual PDF link annotation
- https://cgeminfos.ma/upload/file/zibibava.pdfIn PDF document text
- http://keramann.ru/uploads/files/vikewutelimikigetidutuxe.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3c18ea04---zalaleza.pdfIn PDF document text
- http://oilandgaswork.com/userfiles/file/gudapa.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/kuxabijafuxajamizodin.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kq89ptrjogtek1sddt4q615lbu/rujunusul.pdfIn PDF document text
- https://creativitagh.com/pevron/www/img/file/dujokufetoxuwafetot.pdfIn PDF document text
- https://dukupahit.com/contents/files/36855455067.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1ask6es607od5lmbli3a7u3if9/79096928659.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f35da83a855---wujanoxav.pdfIn PDF document text
- http://esistore.be/userfiles/file/30792548395.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/085eca69ef2ce49f52cc2edb22e7ef6c/nagitujopafomazisanawi.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9f5ea06a7cb65ac43b662d2596a5a62/3336104511.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/53669769989.pdfIn PDF document text
- http://congtyvima.com/images/Download/narukum.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d227af3bf3---63689975826.pdfIn PDF document text
- http://mamolenasnc.it/userfiles/files/vapenesunubipef.pdfIn PDF document text
- http://mobitransjogja.com/files/9626136641.pdfIn PDF document text
- http://phannhan.vn/files/usersfiles/files/wedezenezesinuzotenurabik.pdfIn PDF document text
- https://garnizone.com/userfiles/file/50974265049.pdfIn PDF document text
- http://kennycojewelry.com/userfiles/files/202106/1623450334.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b791f58af78---tetufivovaxovevanadiz.pdfIn PDF document text
- http://ilovegabal.net/fckeditor/_upload/file/71334967915.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a128c98cfb1---12386382700.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_off0000e7dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fff3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF3	10572 bytes
SHA-256: `de24cfbe17aacfa72a060053d3dfc7806c3ae4ac7e35d54bb1bd272d7b908ed4`
`font_02_sfnt_off00011802.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11802	17888 bytes
SHA-256: `8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612`

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