PDF malware analysis — malicious · f457acb0d3b0451b

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 02:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1f10e54a9c57a4f83f24250cd736d306 SHA-1: 065f0a999c0b0d395ce95527d94fd848a10bd5ac SHA-256: f457acb0d3b0451b01f98d0df5d2608978c39838dbcf786e7529f14c732b82a0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://originalcheck.it/public/img_admin/file///gekijizexuxorifo.pdf In PDF document text
- https://autohausnschmidt.de/userfiles/file/27176406256.pdfIn PDF document text
- http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zawewuludonufedexujitom.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4029edc0---38609497142.pdfIn PDF document text
- http://furniture83.com/upload/files/damegeruduwif.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021091402171012.pdfIn PDF document text
- http://nawarashop.com/phya/ckfinder/userfiles/files/vemezigozopudadumidukexo.pdfIn PDF document text
- http://koovappadyscb.com/ckfinder/userfiles/files/fakemi.pdfIn PDF document text
- https://adoz.cz/ckfinder/userfiles/files/51030941699.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ijrnf350mq11tktgpvajpn2jah/20467756176.pdfIn PDF document text
- http://ageddfjtjgrade.pretty-match.com/upload/files/83323678469.pdfIn PDF document text
- http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdfIn PDF document text
- https://www.meditech.cz/ckfinder/userfiles/files/pavisegobowexevunipo.pdfIn PDF document text
- http://restokrat.info/userfiles/file/95793388739.pdfIn PDF document text
- https://naucharts.com/ckfinder/userfiles/files/degavimixobalexasusasexa.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1ogkl0gedseha7he7tdq9cj3i7/95771249271.pdfIn PDF document text
- https://bibliotheque-des-arts.com/ckfinder/userfiles/files/genixevewa.pdfIn PDF document text
- http://vagtteam.com/userfiles/Files/wuwexarizonugoj.pdfIn PDF document text
- http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79257205278.pdfIn PDF document text
- http://aktasmatbaacilik.com/resimlerfiles/pigutaweto.pdfIn PDF document text
- http://zhengfutz.com/v15/Upload/file/202197111511794.pdfIn PDF document text
- https://sarna-zapiekanki.pl/ckfinder/userfiles/files/36248615582.pdfIn PDF document text
- https://studybrilliant.online/app/webroot/img/userfiles/file/95653327511.pdfIn PDF document text
- http://ovecollection.com/royal/admin/images/products/file/9300158685.pdfIn PDF document text
- https://cncostruzioni.com/userfiles/file/bopor.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=teatv+latest+versionPDF 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_off0000b5f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5F3	18368 bytes
SHA-256: `2a9b8808a9f8db9bd8a7334417ccbe346e90b31ef8684679881689ce949e9ad4`
`font_01_sfnt_off0000e4f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fd08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD08	10128 bytes
SHA-256: `ec9b4a3356f0c48f14968b6b4cb891dce369d5cc0abd13b870eaa67c75dda952`

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