PDF malware analysis — malicious · 94839eb3e0df24a0

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 00:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a7c290c8e5a8ba41124873b5d2c452b6 SHA-1: 52f12b0f9c1c29baa0a91d3e816ac62a03fb44ac SHA-256: 94839eb3e0df24a029a63c7a2613e3c7b168cf40e5c12fd0ca74fe12e3093d05

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other hosting. These links likely serve as a distribution mechanism for phishing content or further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=gxt2+1000rt120+manual PDF link annotation
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/33cbcbaa5be1f9c83791e68cd7299bdf/wanun.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4a695ce7f1c5c7b02c0a5c2066cdaf38/podiwegabopiberumu.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28378ac950be0099d048f37e4a6bf87d/11339590765.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc0cf678c59765f23890a717279a7cdd/59170426974.pdfIn PDF document text
- https://horizontire.com/userfiles/file/34691862742.pdfIn PDF document text
- https://arerp.kr/data/file///zenotoguripojivojiposute.pdfIn PDF document text
- http://dj-venci.com/uploads/pages/files/ramujivedafesero.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee58ceb22e6---bodagonepux.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/21a8ad01127a609c2989ba6019744289/rivexafekixonevazoxiba.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/5937486616.pdfIn PDF document text
- http://kondicionery-dolgoprudny.ru/upload_picture/file/45141039089.pdfIn PDF document text
- https://agatanorek.com/files/file/44288509373.pdfIn PDF document text
- http://banhangcongnghe.com/upload/FCK/file/2077348640.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac5feae9e---89722166101.pdfIn PDF document text
- https://sanxuattrucauthangkinh.com/Images_upload/files/tiginokasizapevumel.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160940bb1c6dad---9491689394.pdfIn PDF document text
- https://psfund.org/public/uploads/files/cms_files/9759546611.pdfIn PDF document text
- http://fouladsazanco.com/Upload/file/66799240542.pdfIn PDF document text
- http://kielcenoca.pl/files/file/13056758520.pdfIn PDF document text
- http://sweatrinserepeat.com/ckfinder/userfiles/files/28544314090.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/ab72c479a52f902901e44f9b84561cd5/94583673972.pdfIn PDF document text
- https://essuances.com/ckfinder/userfiles/files/dexetifavin.pdfIn PDF document text
- https://magnificenttreks.com/userfiles/file/rikaxojeb.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2bd5ad17735b90787ce01560eb594be6/jarabebibarepaze.pdfIn PDF document text
- http://feriaalainversa.com/uploaded/files/totevemesomev.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_off0000b902.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB902	14412 bytes
SHA-256: `052bfaee53b0225b15eadfc2efecd04de113333ed3d669641afd29018286709b`
`font_01_sfnt_off0000dc8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC8F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f4a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4A6	10292 bytes
SHA-256: `ec3801d3c36d6184b64c0e5553a3c32cfd89d30d8c6d553ed0f6de196305b8a9`

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