PDF malware analysis — malicious · e351fb5e84bd29b8

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 07:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e2ca2124ce4a5b7538e5f64bf6bbbec1 SHA-1: 7135e0a2e3d827c1ea22003aad3743707b69670e SHA-256: e351fb5e84bd29b8afeecacca8e2bf8e08d3f5d7e3b9d936d3795a758565445b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=elementary+principles+of+chemical+processes+4th+edition+pdf PDF link annotation
- http://magogaralbamoble.com/galeria/files/1575645650.pdfIn PDF document text
- https://xn--80aaijzh9b.xn--90ae/documents/file/mosogokixabesubuduv.pdfIn PDF document text
- http://mybed.tw/uploads/files/202109100423019197.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/menoxozibewuze.pdfIn PDF document text
- https://ceccarmehedinti.ro/userfiles/file/sajuvupebeg.pdfIn PDF document text
- https://sushixusa.com/userfiles/files/dubamejerugovizujepujikav.pdfIn PDF document text
- https://genegurumiraclehealer.com/userfiles/file/sijirusobesebur.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea16a52e77---9104618802.pdfIn PDF document text
- https://interstudy.net/userfiles/file/giletazimojolomowewane.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/penetefapozasuwomalone.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c888aea0---kuzobedipanelivajo.pdfIn PDF document text
- http://hublihorse.com/uploads/userfiles/files/gumuwekun.pdfIn PDF document text
- http://kim-clark.ru/files/file/padipunakejudazuraf.pdfIn PDF document text
- http://z-sinpro.com/upload/files/31145871266.pdfIn PDF document text
- http://jenan.com/ckfinder/userfiles/files/22951591980.pdfIn PDF document text
- https://leise.ru/admin/ckfinder/userfiles/files/nobijebuvoturowufu.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/10941059399.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/61973075174.pdfIn PDF document text
- https://udruga-invalida.hr/files/57424569095.pdfIn PDF document text
- https://activsport.ro/userfiles/file/76207103154.pdfIn PDF document text
- http://abwcockeysville.com/uploads/files/58282441102.pdfIn PDF document text
- http://mnwebdesign.dk/userfiles/file/bekajoronetiron.pdfIn PDF document text
- https://ccskin.com/geektic/files/87267140166.pdfIn PDF document text
- http://nguyenxuanhuong.com/upload/files/nowibapiladujezekikurapu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a05f27ae---50206999794.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a26ef1acc---xagazuvup.pdfIn PDF document text
- http://detskypohar.cz/upload/file/9259548705.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_off0000d121.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD121	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e938.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE938	11060 bytes
SHA-256: `27980ba9318495794205740c44efee80e580396c18a6efef5d7e7e781abdf3fa`
`font_02_sfnt_off000102cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102CB	18272 bytes
SHA-256: `681230cf6acbe219088109b26af85054741585ae26885bd14d005cfdf00aa590`

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