PDF malware analysis — malicious · 83ebdf7c4689727e

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 06:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 8e88d730ded62f70b217e437b2267149 SHA-1: 33d8c99aa7c3db5aea1d8a895289899a22961f88 SHA-256: 83ebdf7c4689727ee7252d12b7d4e30a4771a37c30847d06b8aff9258323fd44

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, likely intended to lure users to malicious content. The PDF structure and embedded links suggest an attempt to exploit user trust through a phishing vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5dd3c20b---63001950347.pdf In PDF document text
- http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f08cf11d0---61076029012.pdfIn PDF document text
- https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d366de3824---vevijobisadidubakug.pdfIn PDF document text
- http://postelezmasivu-brno.com/ckfinder/userfiles/files/melaxoviwivebetoxa.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/fopabokegudavejop.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82abc393fd---92135945948.pdfIn PDF document text
- http://masonhn.com/d/files/72937338771.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d4ea57b64d4e31c35d518c7bc0aac4fd/nipemomukalilujorikufodu.pdfIn PDF document text
- https://martensmgt.com/business_school/uploads/file/jegezaxozeradu.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2cce699c---koxavirawiriferexezi.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5vhtmekop61vrrbq49ul9pakb7/93983058280.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc6d33913c---tepukitulili.pdfIn PDF document text
- https://carsen.sk/editor_uploads/system/files/82221163525.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719cd76b0db---52974597809.pdfIn PDF document text
- http://mastera-mix.ru/ckfinder/userfiles/files/rusafewarivovimorajereluv.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c9f604d55bae6971f59b6d07c71cb52a/25430250062.pdfIn PDF document text
- http://thepducphat.com/upload/files/17039366904.pdfIn PDF document text
- https://o2opr.co/userfiles/files/tonorazeni.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fi0a2pd05sk8m83rkmlq3alcjh/40425685225.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fcbf194206bd40a7ea793bca2240bcdd/37532745075.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ca40b17f---genez.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vsu0pui6tee4i90mhvibd93v0u/tovarufipojuxolifajogez.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202106/file/37304506208.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608682571cb0d---27287986397.pdfIn PDF document text
- http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/jopetapexodofi.pdfIn PDF document text
- http://dade666.com/userfiles/202106file/2021062704351470554.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/q41r9ldnbk1jk761vbqsd4ccv4/8297559502.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cut+image+in+a+circlePDF 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_off0000e53f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE53F	16744 bytes
SHA-256: `53fcb4ad45ca1ae39b809acf2bc115174b773ba471cfb14aed566e53b9d8beff`
`font_01_sfnt_off000110da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110DA	10416 bytes
SHA-256: `731e6fd8949e532248a9ae66d1a44adc41d2ab1ea6690af13a042af8f8200a4e`
`font_02_sfnt_off0001286b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1286B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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