PDF malware analysis — malicious · bfd8e89d8ee4611b

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 15:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 42cee57675b38ff6eee971eddee2b14c SHA-1: d3f83b54c2e5c60df52dffddca745a2ecc3ccd1d SHA-256: bfd8e89d8ee4611b58bd0ab8e5e8e1558cb4fbbddd8d689644acd0846db92917

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 high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://nomylo.ru/uplcv?utm_term=drum+beats+pdf PDF link annotation
- https://kheops-so.fr/ckfinder/userfiles/files/gibivozezulusomawefa.pdfIn PDF document text
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/21e5e9513a5a64597260da86e6657a4e/fowaridazixevokupofezux.pdfIn PDF document text
- http://cungcapbaoduongcuanhatban.com/upload/files/14935465397.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/molezit.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/pamoxus.pdfIn PDF document text
- https://an-professional.ru/img/files/file/60625033502.pdfIn PDF document text
- http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/lovosigowusisuwus.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210717120727620.pdfIn PDF document text
- http://dzbnf.com/upload/file///5529291644.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/325bd6dabd567390a2205342e7d308ab/79579690159.pdfIn PDF document text
- https://newtech-utm.pl/userfiles/file/96549237242.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/df69d7de37e31bbd95d93fa20d587d51/62064636490.pdfIn PDF document text
- https://fo-prefectures.com/pages/files/8159170811.pdfIn PDF document text
- http://thanhcongtechtra.com/upload/files/16976430293.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7c618d9f4e902cdb967d3cea3b887537/lazotusisumevovoxib.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/91634470431.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7c2f779f925bbf370f99d40e02e63c2c/79142558695.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085947b7eef2---tejuvugadis.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/74276923040.pdfIn PDF document text
- https://journeywithmypet.com/ckfinder/userfiles/files/sozosidowiraduse.pdfIn PDF document text
- http://stark-tools.ru/images/uploaded/7725980838.pdfIn PDF document text
- https://fajndoktor.cz/images/file/files/83918057000.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091c28339a58---26034372678.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/54032379338.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_off0000d7c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7C9	17972 bytes
SHA-256: `0bed19584f0f9cff0d6c62673cd8bd9485d96768b6cf27f435e6e25b87f3d8bb`
`font_01_sfnt_off0001067a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1067A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E91	10540 bytes
SHA-256: `ad362840f631a6099a864cebbefb4b18cd22606128dbb30353e39c252f065977`

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