PDF malware analysis — malicious · e5f91f9368ac86c8

MALICIOUS

PDF

75.9 KB Created: 2021-08-04 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 342f5859d2f7e473551dce33551a3029 SHA-1: 247906daf17d384bee4048111957f1c6b1f0c373 SHA-256: e5f91f9368ac86c8555959fc83b78109f0155667fbf463873ceff6698be30fbc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it's designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=japanese+from+zero+download PDF link annotation
- http://benhvientantao.com/img_duhoc/files/nutusowurobawo.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608272410c1e2---11178624664.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6d042057932abf631df29bae324ab2c7/xetanirujepesopi.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kjk2qvclcjp3l892t8n6dha6qr/38688802938.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8df84ea9f06741994a1236260d4c5f6d/26873973841.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e42d5f917---bagikekogilixiwoge.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/64cbae70120aa4a473fd5b9180617349/vujexekinirutelale.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790dd3a1e21---79801706578.pdfIn PDF document text
- https://eyescare.vn/app/webroot/upload/ckfinder/files/pirivefi.pdfIn PDF document text
- https://careersourceokaloosawalton.com/files/public/dojinojalixiluxiwijenumil.pdfIn PDF document text
- http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jinepavigeranaf.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1bcd46d7---83045706223.pdfIn PDF document text
- http://upasamed.org/Content/uploads/files/13865452353.pdfIn PDF document text
- https://educhina.mn/editor/files/26890559265.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8hdhj0l27g3pp16n4tl69ilbu9/pafumoxopuz.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a4b7926e6---tosutamidugafu.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/zatoginiletefawaxevur.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b19de36006d---41769975355.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tt06m9ea39nj6nud05hqsj3cs5/kurewufulotoramala.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/memizuwunubefufixe.pdfIn PDF document text
- http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/49031730635.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7ab5f1cc---97104559327.pdfIn PDF document text
- https://catequesisnavarra.org/guiarte_userfiles/files/fakob.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010f4a82ee---tafobumipilikaxenop.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_off0000c5d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5D3	10608 bytes
SHA-256: `367612bf15c895d8ff7c7b04a92ccfc2c34fca950761d102a85f306014859b4c`
`font_01_sfnt_off0000de20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE20	16944 bytes
SHA-256: `fd7eebc2b654b4281eeaf9e569eb8d5b1e23e3632a93600ecbe52d4da7bfdfc7`
`font_02_sfnt_off00010a25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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