PDF malware analysis — malicious · 375a56099951aa08

MALICIOUS

PDF

76.8 KB Created: 2021-07-22 16:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 119c57d0b75d666871120fe3b15775b4 SHA-1: 4436573de62fa650de8dd74bcf5e02e6f2ff5326 SHA-256: 375a56099951aa080ee61b4d064282618372bae4d0a9ff1b19023fcc6b897822

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://tms-operation.com/upload/files/35245795511.pdf In PDF document text
- http://dungcumaymoc.com/Images_upload/files/82900222591.pdfIn PDF document text
- http://smartwealthhk.com/userfiles/30123066826.pdfIn PDF document text
- https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1b696ba0b66b0c156ed523fcf210c8cf/92812224582.pdfIn PDF document text
- http://esoftland.com/userfiles/file/widadiwa.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/22386937821.pdfIn PDF document text
- http://parkhigh65.com/clients/4970/File/boleguzaxosivotu.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r10b26h8npnvanjulip2saq8lg/34747926723.pdfIn PDF document text
- http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6162633205.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9f02df9982b94a56f2f75d55bb151164/83830537043.pdfIn PDF document text
- https://pnp-studio.com/fckeditorfiles/file/45990092457.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/93462569249.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2ca28b14660125ae1a320d524f8d1848/mavamunuj.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b33677d212921c6f149beb22be8cda1/16985781427.pdfIn PDF document text
- http://blessingsngo.in/userfiles/files/55164038391.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a9127fd7e6d33bbbaf7ad05bcc8a2ac7/fafired.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b7f21d0c3e56d5b5f2d249a0c0a42ae/xijen.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i9pe7bf3ju1pic5fmk60sd57ou/33945613425.pdfIn PDF document text
- http://movementlab.dk/userfiles/file/9428419125.pdfIn PDF document text
- http://langmypham.com/luutru/files/pebefu.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf09790144---serofibilosutisegilixetu.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/a248onvsur62nmm85g6aph0efs/serufi.pdfIn PDF document text
- http://extracam.es/app/webroot/arxius/file/72237955452.pdfIn PDF document text
- http://szakkepzosiklos.hu/upload/file/5658642264.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/87664336376.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dcab2589---52348710030.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/942469873f45b22beaa4421debb8c48f/fudepukenitupanob.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chartered+accountant+institutePDF 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_off0000c759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC759	16928 bytes
SHA-256: `5e3afedff8b3f30605e6009c29dfcbfd927da6b5b6fa6d0753fbb61cd11e7cb7`
`font_01_sfnt_off0000f3d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3D5	10552 bytes
SHA-256: `91840d6dee9d41a6498d2cdc69de97b195ac51f76ce875f20825e4cf41b0acad`
`font_02_sfnt_off00010bdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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