PDF malware analysis — malicious · c746c6c335615923

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 20:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4661e5bfce90bb78dd89afeaa1078dc5 SHA-1: 043c158e038ee7f343bcef0d5c2dbb9dce1d50c6 SHA-256: c746c6c335615923c0c9f6fdaa84223afc8ba82d5440b65099ada5556a8f3441

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable or compromised hosting indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kpku44jt73up1ltkv2lom034i7/28202564870.pdf In PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce28974dea1---wosetafizoveruzexigezid.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d10163c7a---zuriro.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4765c0503---wurumesuzizevek.pdfIn PDF document text
- http://vivatbacchus.hu/files/file/1876455391.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2bc2aaa2da5d8c41a420a812b1a804a5/86640347468.pdfIn PDF document text
- https://alajuusa.eemedia/contents/file/zikopo.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/544b4823a4199d1e29ce1c482c345bd7/korowejuregur.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/eb9ca4cad8bbf952d2dc72726f679fac/sisuve.pdfIn PDF document text
- http://xedaptap.net/userfiles/file/tenapet.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a773e1210cf---84098834213.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e290c7b46f---5929602572.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9n09n3kulssiekp25t8gmai643/44272369935.pdfIn PDF document text
- http://gvs-russia.ru/admin/ckfinder/userfiles/files/jigivitulezimipov.pdfIn PDF document text
- http://tks-forever.com/upload/2021/06/25/file/91215422237.pdfIn PDF document text
- http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/37165644504.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca05338b33---zekoledekubopuxijixutarew.pdfIn PDF document text
- https://panegovernance.com/ourprojects/chowki/UserFiles/file/vapavixibejesabolox.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6cb577d26---sanex.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0db5bfd3b---fatuzemenuwuzise.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bbd24f4beef4a2d88f0c873974928836/51443769262.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/59625b74c98c9c8f3315d56663dbd0ef/rakerubap.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/52211193040.pdfIn PDF document text
- http://healthywithhart.com/res/file/bivalilodemuzugenefixa.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ca37caae23086e178b0ff357fbe0a66/lujezelewa.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07118ab0---rexidavowidujevur.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=plains+biome+seed+minecraftPDF 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_off0000f8e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8E2	10776 bytes
SHA-256: `9217d3f852c95f9f461a8f8808dd74248f2bedeef7e095b56565f6d19275675d`
`font_01_sfnt_off000111a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111A3	19320 bytes
SHA-256: `9e820d1c9649329a0fd061357070ecf4e4c58fdcf5db12623666a820fd1a6cb4`
`font_02_sfnt_off000142ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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