PDF malware analysis — malicious · 58b166ef5417f7bb

MALICIOUS

PDF

77.6 KB Created: 2021-10-07 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: a82dfa689a8c7f989cd8d1d0cc062d40 SHA-1: bdaf8dc56863b1e4f25532be5130c30dcc710a53 SHA-256: 58b166ef5417f7bb135f78f7e1901a210b14a5fe6c541f0a193750c9b41f9f94

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=cube+of+8+is PDF link annotation
- http://rutka.pl/media/upload/files/fc27276e9d3ad93ca20a3020fad2078b.pdfIn PDF document text
- https://purefeeling8.com/data/file/63520230202.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151bf638026f---76589453342.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b27b36f12b1594805b52906c482ded47/39253017574.pdfIn PDF document text
- https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/79429287652.pdfIn PDF document text
- https://phukienbep.net/media/files/fadofeku.pdfIn PDF document text
- http://gradn.ru/uploades/fckeditorfile/duvifanezovukelupak.pdfIn PDF document text
- https://stgeorgedentalcare.in/ckfinder/userfiles/files/badebodopigejijojawude.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e542e87---74519434439.pdfIn PDF document text
- http://thoitranglani.com/upload/files/37735290692.pdfIn PDF document text
- http://lynhuagiasi.com/Images_upload/files/74699904942.pdfIn PDF document text
- http://noticiascgnews.com.br/ckfinder/userfiles/files/vukevamezutegikibarur.pdfIn PDF document text
- http://christopherdallo.com/file/60858664002.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/834c7c24d08760c1d0c8a519c87d804d/74416802027.pdfIn PDF document text
- http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/95265450794.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109250944435940.pdfIn PDF document text
- http://ned.ru/uploads/files/mizuzuluvafomiwow.pdfIn PDF document text
- https://calson.garment-pro.com/ckfinder/userfiles/files/32367500721.pdfIn PDF document text
- http://www.gabrielamaciel.net/images/content/file/zosejotupajunudafoziluve.pdfIn PDF document text
- http://coimbrasoftware.hu/images/uploads/files/lusulimazoduwavulavu.pdfIn PDF document text
- https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdfIn PDF document text
- https://floridainvestment.cz/files/file/buxupipo.pdfIn PDF document text
- https://pensiuneaselina.ro/userfiles/file/xiporo.pdfIn PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rapijisukepeminakaw.pdfIn PDF document text
- http://toanthinh.vn/webroot/img/files/zimasebuvolorat.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_off0000cf83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF83	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e79a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE79A	10176 bytes
SHA-256: `a8d9ae7cd1fd7ac9095e614be2c6523c343e46868951befe8d1fe26e8018e817`
`font_02_sfnt_off0000fe8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE8F	16684 bytes
SHA-256: `4a5c3028307b3eb46fbfc8735f05a107aafa8292c78672e2d8adf6be9107eb5f`

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