PDF malware analysis — malicious · ee4f40e872f749fb

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 01:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 2b63fb16030f532540e8ff8d935a2a99 SHA-1: b99362e0f77a7315b8312e19da84b23684c97817 SHA-256: ee4f40e872f749fb7a90aee2f270ccbe044b7efa2490f88a7adbce2964259ef8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=csv+file+converter+to+pdf PDF link annotation
- https://g55net.com/webpagebuilder/ckfinder/userfiles/files/bofilatosimesepivejixi.pdfIn PDF document text
- http://farashimirooz.com/files/kurojoverimagizo.pdfIn PDF document text
- http://mn-print.ru/ckfinder/userfiles/files/7444124722.pdfIn PDF document text
- http://msslink.ru/userfiles/files/kibukefuluvurore.pdfIn PDF document text
- http://3e3i.com/UserFiles/file///xekoxinodibojigifemesemo.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/bobebisasazurubunu.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e1ce17468---kaziziloxuzidatiruwinagab.pdfIn PDF document text
- http://toonesk.com/upload/kolevivozijisakigudupem.pdfIn PDF document text
- http://kazuma.ru/ckfinder/userfiles/files/64917395479.pdfIn PDF document text
- http://citescolairedeledit.com/include/file/82938309851.pdfIn PDF document text
- http://ty-int.com/files/files/22969883042.pdfIn PDF document text
- http://czerwoneiczarne.pl/files/file/37931550767.pdfIn PDF document text
- http://aircond.md/upload_fck/file/87761637105.pdfIn PDF document text
- https://arvikabc.com/images/uploadedimages/file/67630766520.pdfIn PDF document text
- http://kondicionery-vidnoe.ru/upload_picture/file/41838906343.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/68ids71un6vnrru5uafcsbv3s5/firawukotadanesi.pdfIn PDF document text
- https://bayihoki99.com/contents//files/77153856804.pdfIn PDF document text
- http://df-foundry.net/d/files/dafil.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160cc82d3345b8---lejagar.pdfIn PDF document text
- https://dm288.rs/slicice/file/sureburavobubexanitozu.pdfIn PDF document text
- https://vatlieutaphu.com/upload/files/98739894522.pdfIn PDF document text
- http://capital96.com/userfiles/file/wekutosisaderivusor.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0b78ab125b382395966db02c9101351c/teneteda.pdfIn 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_off0000d60a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD60A	10548 bytes
SHA-256: `869a9c30c6a414aa803eaf525c116ad839eb61d3b600bc57a0eacec69e264404`
`font_01_sfnt_off0000ee33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE33	18060 bytes
SHA-256: `0f11084e333b4f5190b0d85f5804fc6a8cc736d3c305de9a964de2136e547ca4`
`font_02_sfnt_off00011d08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D08	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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