PDF malware analysis — malicious · 4bc1cbc7557dac4f

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 18:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 54dd4a003e918e7ba2edb6fad647c19d SHA-1: 9d4f5213ed5b791e81b2971b59ad8b84d858b578 SHA-256: 4bc1cbc7557dac4f65764cec82936a45d6537c332bb0df955298c97131782f49

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and extracted URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 https://philabc.ru/uplcv?utm_term=decameron+summary+pdf PDF link annotation
- https://apoiotelecom.com/imagens/img_fckeditor/file/97388437559.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dd8ca33aa23ca9fd82600804d3dbc599/fesabarujamoxu.pdfIn PDF document text
- https://totspotdaynursery.co.uk/ckfinder/userfiles/files/vililomugafujojaxetewe.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddeb18de0c5---lepemo.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jbt46mldkumgbs5ft4o1l3kko8/40084606900.pdfIn PDF document text
- http://yousefmaktabi.com/ckfinder/userfiles/files/fevevugoliw.pdfIn PDF document text
- https://mekongtransport.com/upload/userfiles/files/bulozemeviwogofirevefis.pdfIn PDF document text
- http://hotstamping.pl/files/file/xijobalimogafu.pdfIn PDF document text
- http://transcash.com/ci/userfiles/files/finadivotukutujokazipoz.pdfIn PDF document text
- http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/44095525501.pdfIn PDF document text
- http://exito-opakowania.pl/userfiles/file/nozafubum.pdfIn PDF document text
- http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/52796239055.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/63471375685.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/839c5ff02acd2f4a2b54c171c7eacf98/jerorebimuzopevigigafo.pdfIn PDF document text
- http://esoftland.com/userfiles/file/fovadunu.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/90cf87318f83f7d841b91ef8579307ff/68709510780.pdfIn PDF document text
- http://deleersnijder-bocaege.be/images/file/mejifekel.pdfIn PDF document text
- http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/74449140677.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f4f37792b20d21c0c21bfcdaa9d88963/sinax.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c345f91e27e---80149978996.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021061306305678.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b22bf474b2456ab74afa5f17f9a8bfa9/72491681785.pdfIn PDF document text
- http://ixtvs.de/_upload_bilder/_filemanager/file/megalozopet.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/1894617174.pdfIn PDF document text
- https://il-gusto.com/images/file/69816159022.pdfIn PDF document text
- http://atol-res.pl/uploads/file/varepaxezogaruzop.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3765251dfa850b0a7ffed969f9e67f8b/63807166910.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_off0000eb15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB15	18064 bytes
SHA-256: `727b2f548d90afae9d23cc749bf3246e8a74314eced45b0c57415f7e059a76b3`
`font_01_sfnt_off0001197a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1197A	10760 bytes
SHA-256: `e75c2008073431cefbb7442bac8c90b9e8e8f9fa036a8728a06f83ceec95556c`
`font_02_sfnt_off00013239.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13239	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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