PDF malware analysis — malicious · 0933fb2778f6d8ce

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 504aefcd72204b5e4ea994b06926fa42 SHA-1: f3e31cf64171008f9e69761ed6cff1368a892708 SHA-256: 0933fb2778f6d8ce395234fab6d7ccb62118db2a2fe01d539c9123c58a5cf9e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a high likelihood of malicious intent.

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://coretry.ru/uplcv?utm_term=lobus+otak+dan+fungsinya+pdf PDF link annotation
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135f340e70---nujojilovubeva.pdfIn PDF document text
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad6b61ff2---gipowivajiwawavi.pdfIn PDF document text
- http://arabic.cz/ckfinder/userfiles/files/56583960333.pdfIn PDF document text
- https://sunnyvale.com/wysiwygfiles/file/ziniwetugosusapumak.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dfc44bb4936d1077ee25e0c8fe72ca8f/46589527880.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0904ba346cfdf97482c324e7a9bae72/41530931022.pdfIn PDF document text
- http://ipsgroupjjn.org/userfiles/file/nixepidebomafiwo.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/61738350007.pdfIn PDF document text
- http://huucodatlanh.com/userfiles/file/96076786193.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a751951132c142dfd017857e329bfb7c/lamekuwikorokunumubuje.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4f7d01b3---7400301095.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2e08aeeed---6707054619.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/30hjmro7j0hcoo84c6t8vq2f38/puturupomijumurufas.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6ac4328d---75121647776.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800c583f8---mopod.pdfIn PDF document text
- https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/fadaketikesadomekomowapo.pdfIn PDF document text
- http://robwalker.net/fckupload/file/63099110130.pdfIn PDF document text
- http://www.companyforte.com/imagenes/editor/file/48163474527.pdfIn PDF document text
- http://digivideos.net/ckfinder/userfiles/files/40343927853.pdfIn PDF document text
- http://tecsun-moscow.ru/docs/file/ketometaz.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/punilisafarajabu.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/15225636878.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611574f616305---lafutufapurig.pdfIn PDF document text
- http://www.romanschatztruhe.de/img/files/6147713241.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/32lepi9v3mcttangp5u0dc93mi/viminexo.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_off0000edde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDDE	16552 bytes
SHA-256: `1e8d6b6f5ffb0477c15e3f0ff1745aac866d8ac8ddefd3b5535387aa033e987d`
`font_01_sfnt_off00011854.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11854	10796 bytes
SHA-256: `0f14128e113abe35f9982e404e2694a9fad2cda140407ffd7bebc4784916cd54`
`font_02_sfnt_off000130f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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