PDF malware analysis — malicious · 68a67fb6655d0080

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 03:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d7124a823c3d7585cdc8b0cbef701233 SHA-1: 216437a427f9d033558abeed8ac0d068f4f6b8c0 SHA-256: 68a67fb6655d008092b1ba09ea4f822054b8a43051d9b10ba059b2abebf0dda9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 http://xn--49s538bo8ux8c.net/userfiles/file/41715306077.pdf In PDF document text
- http://hanlacsclub.com/ckupload/files/jipek.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d1e88442---77321320328.pdfIn PDF document text
- https://phongkhamtamthan.net/uploadeditor/files/44617809786.pdfIn PDF document text
- http://www.kroonzuivel.nl/ckfinder/userfiles/files/36859013887.pdfIn PDF document text
- https://nwdglobal.com/ckfinder/userfiles/files/43015821917.pdfIn PDF document text
- http://auswallendorf.de/userfiles/file/wuvoz.pdfIn PDF document text
- http://actinq.nl/upload/file/lubutozudaga.pdfIn PDF document text
- https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/bedevupuvota.pdfIn PDF document text
- http://ha-sine.com/d/files/pitapunazogezixubi.pdfIn PDF document text
- http://www.bandungmesin.com/file/39971029960.pdfIn PDF document text
- https://ladangmimpi.com/contents/files/60761396172.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141115a44635---sudasowi.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f57007054cde1599b5f8371ea76e8259/20120828593.pdfIn PDF document text
- http://tahi.hu/ckfinder/userfiles/files/75997977479.pdfIn PDF document text
- http://srilakshmienterprises.net/uploads/68941370462.pdfIn PDF document text
- https://pecintajp.com/contents/files/27385720371.pdfIn PDF document text
- https://durimawar.com/contents/files/88322161864.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ccc9848ee82130a68393a11d52f9f6cc/91286850698.pdfIn PDF document text
- http://vinhomeshaiphong.net/app/webroot/img/files/82083323821.pdfIn PDF document text
- http://caogenzhiben.com/filespath/files/20210906074930.pdfIn PDF document text
- https://luatsuavina.com/userfiles/file/kozuforumupegabonuwuxor.pdfIn PDF document text
- http://sakulchaiplace.com/Uploads/file/44683354404.pdfIn PDF document text
- http://euro520.net/userfiles/file/1630695866343748903.pdfIn PDF document text
- http://www.mamafoundation.cz/ckfinder/userfiles/files/84397453101.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3thbpu1ta10scck6qma3ngtp2n/35514412260.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+roadhouse+online+freePDF 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_off0000db2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f343.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF343	10664 bytes
SHA-256: `71f7a54ce8c4c784c704fa5f7ccd9fbe2975f8d79cd2c157c3d7d8681cfa8f56`
`font_02_sfnt_off00010ba4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA4	17844 bytes
SHA-256: `7d3eb41de48c177bf29a77f9af004b475a31f7e8b244579125f3434e05ce16ca`

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