PDF malware analysis — malicious · abcfcb7668c59f01

MALICIOUS

PDF

80.4 KB Created: 2021-08-29 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f749d7b3577e21c5fd5da8aef0df3fb8 SHA-1: d531226bd8cb4614d575e3b843f5eedb4422fa5e SHA-256: abcfcb7668c59f019d55d0ffba34d5a64f00e954ad51a8d3d939600b991a7fb4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure align with a link farm attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=linear+homogeneous+recurrence+relation PDF link annotation
- https://ksmt.edu.np/assets/ckfinder/userfiles/files/34238058743.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf050fca6---83553485372.pdfIn PDF document text
- http://szpital-sulecin.pl/images/fckfiles/file/80918682612.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488655a2---mezurimuzirurolu.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/99067484166.pdfIn PDF document text
- https://sanvexe.vn/webroot/img/files/18203475716.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rj2ejiofngtdll2413ll3b6icq/kamolarokavixazunilos.pdfIn PDF document text
- http://mobilesamara.com/img/files/file/wizezezunevuku.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc4a3716f---fizasopepo.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/jetukivewuju.pdfIn PDF document text
- https://mimpiindahsatu.com/contents//files/ragawurafononorikologum.pdfIn PDF document text
- https://magicdiscoradio.hu/userfiles/file/47189813625.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/noxuxevateketuvobu.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e550f54ac41a32d63749392244d9510c/15391489414.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7m1i8k9grpnhjrgng6a0r8tbn7/74833988864.pdfIn PDF document text
- http://padgettlawreunion.com/clients/79772/File/41530140945.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e36ed4d9c71e14f4b5d19094d7a1ccc0/zarex.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/575e017a85c65dba5a021055bcf6e646/28464176356.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e94d2845a728fce6bc153833267aee59/29710861705.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8adfb5d39---mugixiruxib.pdfIn PDF document text
- https://ever-progress.com/upload/files/wejidopuxujadenawif.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/ropimokuvopi.pdfIn PDF document text
- http://elcampoeco.org/FCKeditor/file/67862421712.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b035f914c8---72006499064.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2p96kpukttts3c684p94acss4g/65302707356.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_off0000d346.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD346	10732 bytes
SHA-256: `13daecba864de687b949a4f326cb3f8553449e9625bf89b35355b3a219155714`
`font_01_sfnt_off0000ebbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBBE	17772 bytes
SHA-256: `856efcac63c4e225265a0fa293e83d8289660aa66df87601a6e115270f19c16b`
`font_02_sfnt_off00011ab9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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