PDF malware analysis — malicious · 52e5150190736abd

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 07:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 311cbbb1fa1f6d7516f3c6f82abe17fc SHA-1: 1bef7feb9217707b806c1a215e830493c6c88c2b SHA-256: 52e5150190736abdb0e6077252475c6bd57fec74e9105207850a8257632deaf0

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 detecting it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of these links suggests an attempt to lure users to malicious sites, aligning with phishing or malware delivery tactics.

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://medvor.ru/uplcv?utm_term=arrival+of+the+birds+score+pdf PDF link annotation
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6142099c5---60760951829.pdfIn PDF document text
- http://cmtdental.com/upload/ckimg/files/gasexiwud.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bc0283185493634b4aae98dfd9ef533e/firizitiwukexifemid.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fa067b1c86edd2958954ec27dc3b0f74/82844736098.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2c2cf627d0f1a11a0c19a60ababff9db/49768977500.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/38l91rch9rp6ff67s53d5is3lo/23445522228.pdfIn PDF document text
- http://kocavietnam.com/upload/files/wigalerufajazafuve.pdfIn PDF document text
- https://4of100churchstreet.com/assets/media/files/62953248641.pdfIn PDF document text
- https://openkomm.yussfone-crm.com/userfiles/file/vaxanixikilejevozurejigo.pdfIn PDF document text
- http://techscreening.com/userfiles/files/70968639919.pdfIn PDF document text
- http://solarhomepage.ch/fckeditor/editor/images/file/98503638707.pdfIn PDF document text
- https://elperrocallejero.info/ckfinder/files/silarekolevapubaluwu.pdfIn PDF document text
- http://lmtechsolution.com/userfiles/gavawil.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/26334234281.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/megaxuwegoluketejobipagu.pdfIn PDF document text
- http://associazionemillesogni.it/userfiles/files/57891076488.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f7ca85bd---xibusazubexe.pdfIn PDF document text
- http://doer-sh.com/Uploadfiles/files/68736042366.pdfIn PDF document text
- https://juhaszautovill.hu/userfiles/file/lurekuxepasujedok.pdfIn PDF document text
- https://lanjutpt1.com/contents//files/34793412214.pdfIn PDF document text
- http://bajajsports.com/userfiles/file/73852718213.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/kadimutanoju.pdfIn PDF document text
- http://boilerservis.ru/uploads/files/jatuzebowetetamusof.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5acab099---vakitubarusula.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_off0000de05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE05	19344 bytes
SHA-256: `e56f91b1083e8e02d9fcded5234e3ca424fa7bf0f852462c27e264ed5965bd9f`
`font_01_sfnt_off0001106b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1106B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012882.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12882	10800 bytes
SHA-256: `cd3923216d8ccb085f78458af48ed645a4bedce6e84c251cb98a929f6a741044`

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